SuzukiSavage.com - Print Page

SuzukiSavage.com
/cgi-bin/YaBB.pl
General Category >> Rubber Side Down! >> Shortened air-filter pipe leads to sputtering
/cgi-bin/YaBB.pl?num=1684039744

Message started by Moarpower on 05/13/23 at 21:49:04

Title: Shortened air-filter pipe leads to sputtering
Post by Moarpower on 05/13/23 at 21:49:04

Hey guys,

I relocated my battery and reinstalled the stock airbox as an electronics and wiring box.

My setup is as follows

DR650 Cam
96.5mm piston
155/47.5 jets
Pod style filter
Straight exhaust with minor baffle

I originally had the pod filter on a 90-degree pipe that was about 10cm long. The bike ran great.

Now I have removed the longer pipe as it wont fit with the installed airbox. Same filter however the bike sputters at high revs, especially if accelerating quicky. If I don't climb the rev range fast it can still make it up to speed.
I have tried adjusting the carb from as little as 1 turn all the way out to 3 and it keeps presenting the issue, though it is very slightly better at 1 to 1.5 turns out and worse at 2-3.

I have a bigger pilot jet coming already but I doubt this is the issue

Title: Re: Shortened air-filter pipe leads to sputtering
Post by justin_o_guy2 on 05/14/23 at 03:38:20

Years ago I was reading about intake design. The only thing I remember is it said
You need a volume between the filter and carburetor that is at least equal to the volume of the cylinder. I don't have a link, I probably searched

Intake design theory

Title: Re: Shortened air-filter pipe leads to sputtering
Post by Moarpower on 05/14/23 at 04:21:27

But surely most people just have their filters mounted straight to the carb tho?!
I probably need to adjust the needle or something

Title: Re: Shortened air-filter pipe leads to sputtering
Post by LANCER on 05/14/23 at 05:20:44

Straight pipe wit minimal baffle ?
Try a larger pilot jet.
Re/adjust pilot screw.

Title: Re: Shortened air-filter pipe leads to sputtering
Post by Moarpower on 05/14/23 at 05:25:13

Yeah it's a drag pipe with an almost useless baffle in it. I really think it does nothing at all.

I have a larger pilot jet coming but I thought that would only affect lower throttle ranges?
. Any idea how I should set the needle with this setup?

Title: Re: Shortened air-filter pipe leads to sputtering
Post by Dave on 05/14/23 at 09:01:52

The pilot jet has no affect on how the engine runs once you get over 1/4 throttle.

Make sure the pod filter you are using does not obstruct the oval shaped port at the top of the carb inlet. That port allows air to reach the area under the slide diaphragm....if you block that area the air jets and slide cannot operate properly.

155 main jet is likely too big and the engine will run too rich at higher throttle settings.

Title: Re: Shortened air-filter pipe leads to sputtering
Post by Moarpower on 05/14/23 at 14:07:57

Thanks Dave. The 155 had been able to be tuned to run well with the longer intake pipe.
This issue has me stumped. Currently the the needle only has the brass clip on the top position with no washer

Title: Re: Shortened air-filter pipe leads to sputtering
Post by Dave on 05/14/23 at 15:23:33

Look at this thread:

http://suzukisavage.com/cgi-bin/YaBB.pl?num=1347609265

Title: Re: Shortened air-filter pipe leads to sputtering
Post by Moarpower on 05/14/23 at 15:51:51

Wow thanks Dave
The longer pipe is a more solid material than the rubber of the filter so this could be it !

Title: Re: Shortened air-filter pipe leads to sputtering
Post by DragBikeMike on 05/14/23 at 16:21:41

Moarpower, can you post some photos of your installation so we can see exactly what you are wrestling with?

You mentioned that you are running the slide needle clip in the "top position" with no washers. Is there any chance your needle is being pulled out of the needle jet when the slide is in the uppermost position? Does your slide needle have any markings on it? Markings that would identify the needle, like 5C16 or 5C39? Is it possible your slide needle is some sort of aftermarket part, like from a carb kit?

Title: Re: Shortened air-filter pipe leads to sputtering
Post by Moarpower on 05/14/23 at 16:39:58

Thanks Mike.
I'll take a bunch of images tonight.

Title: Re: Shortened air-filter pipe leads to sputtering
Post by Moarpower on 05/17/23 at 19:00:30

Very frustrated by this issue!

I made sure the hole at the front of the carb intake was not blocked by the filter, even added a 10mm spacer to make sure.

All i did was fit a pod filter to the carb directly and its sputtering horribly when I try to accelerate quickly and wont go over 80kmph as it just sputters.

Low revs are fine and it will rev pretty well while stationary.

I pulled the carb and gave it a thorough cleaning and it still happens.

Is it really likely that the shorting of the intake runner caused such an issue ? If so is it a lean or rich issue that I have to figure out.

Title: Re: Shortened air-filter pipe leads to sputtering
Post by ohiomoto on 05/17/23 at 19:31:26

Make sure your slide isn't worn and sticking.

Title: Re: Shortened air-filter pipe leads to sputtering
Post by Moarpower on 05/17/23 at 21:29:15

how can i test that? With the carb out of the bike it moves up and down freely

Title: Re: Shortened air-filter pipe leads to sputtering
Post by Moarpower on 05/17/23 at 21:32:12

Today i replaced the slide needle. The one that was in the bike only had one slot for clips. The new one had 3, the middle of which lined up with the single slot on the old one.

I tried on all 3 settings with next to no difference.

I also tried blocking different amounts of the air filter with tape, but again no change.

The bike takes of as quick as always but cant make it all the way through the reve range.

Could this issue be something relating to spark delivery at all ?
I just want to ride this bloody thing. Unfortunately I cant put the old intake pipe back on to see if it fixes things as its damaged and there is no longer any room for it. I will need to get a 90 degree runner

Title: Re: Shortened air-filter pipe leads to sputtering
Post by Moarpower on 05/17/23 at 22:05:35

595F502C2E292D1D0 wrote:

The needle was marked 5C17. It only had a single slot. The issue was present only after I changed the filter length but it could just be a coincidence.

Title: Re: Shortened air-filter pipe leads to sputtering
Post by Moarpower on 05/17/23 at 22:47:20

Here is the needle that was in the bike.

Title: Re: Shortened air-filter pipe leads to sputtering
Post by Moarpower on 05/17/23 at 22:51:06

Picture of the slide. Worn or still good? It's moving fine

Title: Re: Shortened air-filter pipe leads to sputtering
Post by Moarpower on 05/17/23 at 22:53:20

This is the current filter.
I added some pipe and silicon tube to move it away from the oval hole of the carb. The issue was still present.

I then taped off a large portion on the filter to see if it was a lean issue, no change.

It was running well with the same filters just a longer runner that cleared the factory battery tray.

Title: Re: Shortened air-filter pipe leads to sputtering
Post by Moarpower on 05/17/23 at 23:31:46

Spark plug is pretty black

Title: Re: Shortened air-filter pipe leads to sputtering
Post by Moarpower on 05/18/23 at 00:22:41

https://youtube.com/shorts/eRu1vGn6Ams?feature=share

Here is a link to to a video of it running under wider throttle conditions.

Hard to hear over the wind noise but you can definitely hear the sputter im referring to .

Could it be something like the float, or maybe a spark issue ?
Or could.it really be just the shorter intake tube ? This doesn't make sense to me.tho as many ar running filters directly on the carb.

Title: Re: Shortened air-filter pipe leads to sputtering
Post by Moarpower on 05/18/23 at 02:22:30

I need this running by Saturday [ch128542] any help would be greatly appreciated. Tomorrow I'll change the needle back to how it was and see if I can make a longer intake runner again. Hopefully that will help but I'm not optimistic

Title: Re: Shortened air-filter pipe leads to sputtering
Post by DragBikeMike on 05/18/23 at 02:32:28

Your air cleaner is too small. There is less surface area than a stock flat-panel filter. The small filter doesn't provide enough air at WOT. It will cause a rich mixture.

Your spark plug is black. That indicates a rich mixture. It's fouled. You need to replace it. You need to be sure that the fouled plug doesn't cause misfire.

When you remove the spacer from the top of the slide needle, and you don't replace it with something (like half a spacer or several washers), you set up a condition where the needle can be raised entirely clear of the needle jet. On this particular carburetor, the slide needle controls fuel flow even at WOT. You can add more taper to the end of the needle, but raising it completely out of the needle jet will open a flood gate. You need a few washers on that needle, or half a spacer.

That thing sounds like it's goin grossly rich as soon as the slide goes wide open. A 155 main jet will not cause that. I've run jets over #200 with a stock needle and it still runs clean at WOT. So, you are either smothering the thing with that little air filter, or you are pulling the slide needle completely out of the needle jet.

It's also possible that your main air bleed system is obstructed. It's a very small jet. The passage behind the jet could also be plugged, or the emulsion holes in the needle jet could be plugged.

Do a quick & dirty test. Install a new spark plug and remove your air filter (hose, plastic tube, filter, all of it). Run it without the air filter. Get it started and rev up the engine. Observe the slide while you rev it up in neutral. Make sure the slide opens all the way. Then ride the bike. Does it run OK without that little air filter? Does it run better or worse?

Title: Re: Shortened air-filter pipe leads to sputtering
Post by DragBikeMike on 05/18/23 at 02:40:34

This is your main air bleed. Make sure it's not plugged up. Also make sure that the passage between the main air bleed and the needle jet is clear. Remove the needle jet and blow carb cleaner through the main air bleed to verify that the jet and passage are not plugged up.

Title: Re: Shortened air-filter pipe leads to sputtering
Post by Moarpower on 05/18/23 at 02:41:48

Hi Mike. This is the size of the filter.on the bike. The photo I showed just had a lot of the area taped off to see if it changed the issue but it didn't. Or at least not in a way that I could notice.
This is the same filter that I had on with the longer intake runner and it was running ok.
I also tried with one of those foam unifilters and it did the same thing.

I agree that it seems to be a rich issue. The spacer was originally on the needle but it was old and brittle (I'm referring to the plastic, brown colored thing that was on the very top of the needle)

Could it also be a spark issue ? I cleaned up the sparkplug with a little carb cleaner and all the carbon fell straight off.

Title: Re: Shortened air-filter pipe leads to sputtering
Post by DragBikeMike on 05/18/23 at 02:45:59

The main air bleed provides air correction to the needle jet. The needle jet has eight small holes that admit the air and mix it with the fuel to form an emulsion. Make sure the eight small holes are all clear. These are the emulsion holes. See how you can run a small wire through the holes.

Title: Re: Shortened air-filter pipe leads to sputtering
Post by Moarpower on 05/18/23 at 02:46:21

I'll get a new plug and do the test tomorrow

Title: Re: Shortened air-filter pipe leads to sputtering
Post by DragBikeMike on 05/18/23 at 02:52:27

You need to change the plug to rule out any sort of ignition related misfire. It needs a new plug so put a new plug in. Do the quick & dirty check with the air filter removed entirely. Make sure the slide lifts all the way, and then ride it. See if it will pull cleanly without that filter.

Title: Re: Shortened air-filter pipe leads to sputtering
Post by Moarpower on 05/18/23 at 02:56:16

57515E22202723130 wrote:

I have replacement for the needle jet I can put in the carb tomorrow. How is that part removed ?

Title: Re: Shortened air-filter pipe leads to sputtering
Post by DragBikeMike on 05/18/23 at 02:59:28

How did you verify that nothing is obstructing the oval port in the mouth of the carb? When you run without the filter you will be sure that the oval port isn't obstructed.

Once you get the thing to accept full throttle, you can set up a proper air filter and dial it in. No sense trying to fine tune it until you get it to take WOT.

Title: Re: Shortened air-filter pipe leads to sputtering
Post by Moarpower on 05/18/23 at 03:05:29

First I just cut away material from the filter, then I changed it used a larger silicon tube on the carb, put a piece of pipe into that that cleared the hole, and then clamped the filter to the pipe.

Title: Re: Shortened air-filter pipe leads to sputtering
Post by DragBikeMike on 05/18/23 at 03:05:41

To remove the needle jet first remove the slide assembly. Then remove the main jet and main jet washer (you do have a main jet washer, correct). Then use a soft punch and lightly drive out the needle jet.

Keep in mind that the needle jet has an orientation pin in the carb body. When you replace the needle jet, the slot in the jet must align with the pin.

Is your replacement a genuine Suzuki part? Is your existing needle jet brass or stainless steel? Please post picture when you get it out.

Title: Re: Shortened air-filter pipe leads to sputtering
Post by DragBikeMike on 05/18/23 at 03:13:40

"First I just cut away material from the filter, then I changed it used a larger silicon tube on the carb, put a piece of pipe into that that cleared the hole, and then clamped the filter to the pipe."

Not sure I understand what you did, but it sounds as if you simply blocked off the oval hole with that pipe when you inserted it into the silicone hose. Also, I don't think silicone is suitable for use in this application. I don't think silicone is good around gasoline. Maybe I'm wrong. You might wanna look into that.

Anyway, if you remove all that parphenalia and run it without the filter & tube & hose, you will be able to rule all that stuff out. Quick & dirty. New plug, then run without filter. Make sure slide lifts all the way. See if it will take WOT.

Title: Re: Shortened air-filter pipe leads to sputtering
Post by Moarpower on 05/18/23 at 03:16:07

Thanks Mike.

The main jet has a brass washer.
The existing and replacement parts are brass. The replacement just came in a rebuild kit. The one on the bike now is the original.

There was also an alignment spacer fitted to the top of the needle. It was a brown plastic. Is that needed ? As it is brittle and broken.

Title: Re: Shortened air-filter pipe leads to sputtering
Post by Moarpower on 05/18/23 at 03:21:53

This is the replacement kit I used.
I used my existing jets and needle jet and needle until today when I used the replacement needle to adjust the clip height. I added a taper to the new needle. The spring that came in the rebuild kit was also too small in diameter to use

Title: Re: Shortened air-filter pipe leads to sputtering
Post by DragBikeMike on 05/18/23 at 12:12:00

Wow! Moarpower that is a lot of info. I think you are changing too many things all at once. For now, I suggest you stick with my suggestion to change the spark plug, remove the air filter, and run it. Then let us know what happened.

Title: Re: Shortened air-filter pipe leads to sputtering
Post by DragBikeMike on 05/18/23 at 12:14:44

Regarding your carburetor kit. I can tell at a glance that it's got some bogus stuff. Review this post. It shows what to look for in a carb kit. Your kit has a bogus mixture screw. The post gives you all the gory details.

http://suzukisavage.com/cgi-bin/YaBB.pl?num=1641171298

Title: Re: Shortened air-filter pipe leads to sputtering
Post by DragBikeMike on 05/18/23 at 12:27:54

"I used my existing jets and needle jet and needle until today when I used the replacement needle to adjust the clip height. I added a taper to the new needle. "

How exactly did you add that taper? Where on the needle did you start the taper? Do you have measurements of your taper? Can you post a sketch? What sort of measuring instrument did you use?

This is a sketch of a modified stock needle. Note that the needle is plotted out in increments (20mm, 30mm, 40mm, 45mm, 50mm, tip). The modified taper starts at 45mm and runs to the tip. The diameters are given in one ten-thousandth of an inch. That's four decimal places. If you don't have a micrometer with a vernier, you can ruin the needle in a heartbeat.

Did your WOT problem start when you installed the modified slide needle? If so, maybe you put too much taper on that needle.

Title: Re: Shortened air-filter pipe leads to sputtering
Post by DragBikeMike on 05/18/23 at 12:31:09

"The spring that came in the rebuild kit was also too small in diameter to use"

Where are you trying to install the spring? Are you using it on the mixture screw, or on the slide needle?

Title: Re: Shortened air-filter pipe leads to sputtering
Post by DragBikeMike on 05/18/23 at 12:33:45

"I used my existing jets and needle jet and needle until today when I used the replacement needle to adjust the clip height."

Did it run lousy at WOT with all the existing jets and slide needle, or did the WOT problem start after you replaced jets & needle?

Title: Re: Shortened air-filter pipe leads to sputtering
Post by Moarpower on 05/18/23 at 12:46:51

The issues started before replacing any parts besides the intake length. I did notice a slight stutter once in a while at higher throttle ranges. But these running issues only presented when I eliminated the intake pipe.

All of the replacement parts have been for troubleshooting this issue. This includes the tapered slide needle. I followed the diagram when adding the taper

Title: Re: Shortened air-filter pipe leads to sputtering
Post by DragBikeMike on 05/18/23 at 12:54:07

"There was also an alignment spacer fitted to the top of the needle. It was a brown plastic. Is that needed ? As it is brittle and broken."

That plastic spacer is critical to proper performance. When you remove the spacer, it sets the slide needle 3mm higher than the factory setting. In the world of slide needles, that's a lot. If you are running a needle with multiple clip grooves, and you place the clip in the bottom groove, and then you install the needle without the plastic spacer, the needle is now probably about 5mm higher (richer) than the factory setting. And then, if that needle has an extra taper sanded on, you are adding a phenominal amount of fuel at WOT. Sounds familiar.

I'm having trouble following all your changes. Did you/are you running a three-groove needle with the clip in the bottom groove and a modified taper and no spacer?

This is a picture of the stock configuration. The stack from top down is:

Plastic Spacer

e-Clip

Washer

Spring

Is that how you are setting up your slide needle?

Title: Re: Shortened air-filter pipe leads to sputtering
Post by DragBikeMike on 05/18/23 at 12:55:52

This is what the needle looks like when all the parts are on it.

Title: Re: Shortened air-filter pipe leads to sputtering
Post by DragBikeMike on 05/18/23 at 12:59:32

Are you making sure the slide orifice holes are not covered up by the needle retainer plate? The plate can be installed upside down. It will obstruct the orifice holes. When it is installed correctly the holes will be fully open. Like this.

Title: Re: Shortened air-filter pipe leads to sputtering
Post by DragBikeMike on 05/18/23 at 13:04:30

I know that's a lot of info. Just review the stuff I posted and answer the questions. For now, keep your focus on the quick & dirty test. New plug, air filter off, run.

Let us know the results.

Title: Re: Shortened air-filter pipe leads to sputtering
Post by Moarpower on 05/18/23 at 15:01:25

Thanks Mike.
In regards to the setup, yes that's how it was configured. However the plastic spacer looks like it's going to break and has a split. I'll need to find another. Or could I just add a different washer/s in it's place?
I also tried different configurations with new needle but it was all the same

Title: Re: Shortened air-filter pipe leads to sputtering
Post by ohiomoto on 05/18/23 at 19:21:55

5B7977646679617364160 wrote:

Picture of the slide. Worn or still good? It's moving fine

------------

The slide gets pulled open by vacuum pressure. Moving it by hand won't tell you much. You need to test it as described below.

And you are definitely throwing way too much poo at the wall. This isn't a jetting or performance issue. Those don't just pop up out of nowhere. So throwing parts (especially the dreaded "carb rebuild kit") isn't going to fix the issue and you are just wasting your time with them at this point.

This is a mechanical problem. It could be the slide or a blockage of some sort. Start with the slide and make sure it will get to WOT as Mike instructed. If it goes WOT but the problem persists move on to the next item on the list. #problemsolving101

02040B77757276460 wrote:

Do a quick & dirty test. Install a new spark plug and remove your air filter (hose, plastic tube, filter, all of it). Run it without the air filter. Get it started and rev up the engine. Observe the slide while you rev it up in neutral. Make sure the slide opens all the way. Then ride the bike. Does it run OK without that little air filter? Does it run better or worse?

Title: Re: Shortened air-filter pipe leads to sputtering
Post by Moarpower on 05/18/23 at 20:19:16

Thanks Ohio.
The rebuild kit was used when I first got the bike. All I used from it was a few parts, the needles, jets, washers etc were not used. I just cleaned the old original ones thoroughly.
It was running really well with this setup.
Only while I've been troubleshooting have I tried a new needle in different configurations and 2 new jets along with the air filter changes.

Really hoping to get this running in the couple of days so I'll get the plug, reset the needle setup , clean the needle jet and go from there

Title: Re: Shortened air-filter pipe leads to sputtering
Post by Moarpower on 05/19/23 at 22:06:10

Update.
Removed carb and cleaned the emulsion/needle jet. It wasn't blocked but gave it and the whole carb a good clean. Plastic spacer is shot as you can see in the picture
So temporary use of 2 needle shims very nearly matched the size of the original spacer. I'll try to find another spacer.

Installed new spark plug gapped to 0.85mm.

Started the bike and let it warm up for a bit before revving and inspection of the slide. I will attach a video link here when it uploads.

The slide had full range consistently. Did a quick and dirty test and it totally hauls all the way up to 135kmph. No sputtering.

Now here's the weird part. I attached my air filter, more sputtering but nowhere near as bad.
I even attached it with the long tube that was running perfect prior, and it is still sputtering but only just. I made certain to not block the oval hole, removed material and made certain it was not blocked in anyway.

So I'm guessing the rich co dition has fouled the previous plug.

From here, where should I go? What kind d of filter will provide me with enough air? I'm using a 155 main jet but have others coming. 155 is the smallest I have on hand. Should I drop down to 150?

Could the now much less severe sputtering be the the removal of the damaged Plastic spacer ?

I don't want to use a velocity stack as they are rubbish.

Title: Re: Shortened air-filter pipe leads to sputtering
Post by Moarpower on 05/19/23 at 22:24:23

Here is a link of the slide in operation.

https://youtu.be/wTsN9lvtoPQ

Title: Re: Shortened air-filter pipe leads to sputtering
Post by DragBikeMike on 05/20/23 at 02:10:03

"The slide had full range consistently. Did a quick and dirty test and it totally hauls all the way up to 135kmph. No sputtering."

So, now you have a good idea that your problem most likely resides in the filter/plastic tube setup. I suggest you get rid of the current filter & plastic tube. It would be most beneficial if you could post photos of the filter and plastic tube. Try and take a few and post so that we can all see exactly what you were running. I'm particularly interested in the plastic tube.

Title: Re: Shortened air-filter pipe leads to sputtering
Post by DragBikeMike on 05/20/23 at 02:30:41

"From here, where should I go? What kind d of filter will provide me with enough air? I'm using a 155 main jet but have others coming. 155 is the smallest I have on hand. Should I drop down to 150?"

I personally like the K&N RD-0710 attached to a 2" x 90 degree street elbow and coupled to the carb with a 2" rubber coupling. But I run that with a 38mm PWK carb. That same filter setup steals a bit of power when used with a stock carb. I suspect because the stock carb fuel delivery can't keep up with the airflow. The K&N RD-0700 would probably work a little better. Don't use an ABS elbow, use PVC. Don't use a common 90 degree elbow, use a street elbow.

This post provides details on the setup.

http://suzukisavage.com/cgi-bin/YaBB.pl?num=1583103640/0#12

This post elaborates and provides good info on performance when used with the stock carb. It also gives details on why you don't want to use ABS. The pertinent info starts on page 2, reply 27 and continues through page 4, reply 50.

http://suzukisavage.com/cgi-bin/YaBB.pl?num=1625732492

The cylindrical K&N provides all the air you will ever need and allows retention of the airbox. The airbox is nice to have since all sorts of stuff attaches to the airbox. You do have to modify the airbox but the mods are easy. I personally love this setup.

Do not drop down to a #150 main jet. You are running a big-bore high-compression engine with a hot cam and open exhaust. If anything, you will need a larger main jet once you get a proper filter setup.

Title: Re: Shortened air-filter pipe leads to sputtering
Post by DragBikeMike on 05/20/23 at 02:40:55

"Could the now much less severe sputtering be the the removal of the damaged Plastic spacer ?"

Yes, it could, but IMO your problem was more likely related to the air filter setup. You do too many things at once. Had you simply removed the air filter and left the needle alone you would know conclusively. Now you don't know for sure what corrected the WOT sputtering (filter or absence of the spacer). Only make one change at a time.

Title: Re: Shortened air-filter pipe leads to sputtering
Post by Moarpower on 05/20/23 at 03:30:32

Thanks Mike.

Unfortunately I broke the original setup I was using and tossed it a few days ago it was just PVC pipe from the hardware store, couple to the carb and filter with a small amount of automotive radiator hose that fit. Today to test all I did was attach the factory tube that goes from the carb to the airbox, with a pod filter on the end.
The pod filter was just a cheap eBay ones clamped with screw clamps.

The sputtering was less severe but still annoying. It ran great with no filter.

These are the filters I was using.
https://www.ebay.com.au/itm/384118178062?mkcid=16&mkevt=1&mkrid=705-154756-20017-0&ssspo=d8nrjntsthy&sssrc=2349624&ssuid=xnsiiczdr_a&var=&widget_ver=artemis&media=COPY

And

https://www.ebay.com.au/itm/394563510290?mkcid=16&mkevt=1&mkrid=705-154756-20017-0&ssspo=eagu5evssyu&sssrc=2349624&ssuid=xnsiiczdr_a&var=&widget_ver=artemis&media=COPY.

I have now tossed both filters and am looking for a good one with adequate airflow. I assuming the mistake of cheaping out on the filter caused the rich condition that lead to the fouling of the plug. Better rich than lean I guess so I'll not make that mistake again.

Title: Re: Shortened air-filter pipe leads to sputtering
Post by Moarpower on 05/20/23 at 04:01:12

In regards to the elbow I should use, I am using my stock airbox to hide electronics, would a sharp 90 degree elbow like this be ok? Or would the angle cause issues. I am only asking, as the gradual bend elbow with the filter attached wont fit in the airbox anymore unless I redid my electronics.

Mike, The filter you linked has a 64mm flange inner diameter. What did you do to make it fit the 2" pvc elbow ?

I am riding a bobber setup from Bluecollar

Title: Re: Shortened air-filter pipe leads to sputtering
Post by Moarpower on 05/20/23 at 04:03:55

This is how it's setup at the moment to give you an idea of space.

Title: Re: Shortened air-filter pipe leads to sputtering
Post by Moarpower on 05/21/23 at 01:55:36

Today I purchased an air filter that Ill try to make work. Its much larger than motorcycle filters but Ill have to ditch the airbox I was using for electrics.

Today I went for a 30-minute ride and used a PVC tube and 2 layers of nylon stocking material as a makeshift filter. No this is not ideal and not something I will do again. I just really had the itch for a ride today and wanted to make sure it would work.

Acceleration was great. On the way home I rode it a little harder and found slight stuttering at WOT as it neared the top of the rev range in each gear. This is NOTHING like the issue it had with the severe bogging. It would accelerate, stutter a little then keep accelerating and stutter a little more

It topped out at 130kmph at was sputtering a little. Maybe its the stock needle settings or the 155 jetting?

Im curious as to what the top speed in each gear of my 4 speed would be. Riding it hard, Id get to around 70kmph in 2nd, and third would get to around 100kmph

Title: Re: Shortened air-filter pipe leads to sputtering
Post by DragBikeMike on 05/21/23 at 03:24:39

I guess you could dumb the thing down to accomodate the restrictive filter but that sure seems like a waste of a cam, hi-comp piston and free flowing exhaust. Speaking of free-flowing exhaust, could you provide pictures of your exhaust so we can see if that could possibly be causing things to back up?

Installing a smaller main jet might eliminate the slight stuttering at high rpm, but why invest in the piston and cam if you intend to strangle the engine?

This is a K&N RD-0710 clamped directly on to the stock carb. It's five inches long. The RD-0700 is four inches long. Based on your photos, it looks like it might possibly fit your bike. You might have to trim a bit off your airbox. I don't see a battery in the way.

Title: Re: Shortened air-filter pipe leads to sputtering
Post by DragBikeMike on 05/21/23 at 03:26:21

You can see that there is nothing on the filter that will interfere with the oval air entry in the mouth of the carb.

Title: Re: Shortened air-filter pipe leads to sputtering
Post by DragBikeMike on 05/21/23 at 03:28:15

This is one of lancer's Uni Filters clamped directly onto a stock carb. It has a slight bend in the rubber spigot that will allow you to angle the filter slightly to suit your installation.

Title: Re: Shortened air-filter pipe leads to sputtering
Post by DragBikeMike on 05/21/23 at 03:29:19

The UniFilter is also wide open. No obstructions in here.

Title: Re: Shortened air-filter pipe leads to sputtering
Post by DragBikeMike on 05/21/23 at 03:32:58

That super tight 90 degree PVC fitting is less than ideal. Seems to me if you can fit that in there you ought to be able to fit a decent air filter directly onto the carb.

Title: Re: Shortened air-filter pipe leads to sputtering
Post by LANCER on 05/21/23 at 03:55:27

The Uni filter works very well at filtering, is easier to install and fit in tight spaces due to its flexibility. And it’s cheaper by comparison.
I’ve used this filter for years on my Savage.

Title: Re: Shortened air-filter pipe leads to sputtering
Post by Moarpower on 05/21/23 at 04:00:13

Thanks. I tried an unused uni filter off my dirt bike. But it's was only 52mm and needed an adapter. It bogged down horribly I'm sure because of the size.
Mike, were you able to just clamp the K&N on without any shim ? I think it's quite a bit bigger than the stock carb intake?
I ordered the k&n but it's a 2 week wait for me. I bought a similarly sized one from an auto store today but it's slightly bigger and cone shaped.

I will just have to re do the wiring situation

Here is a picture of my exhaust.
There is a baffle in it, but it's just 2 round pieces of metal with holes drilled through them welded about 15cm apart. It's quite loud as it is but I could try removing the baffles.

The only issues I found on the ride today were at very high rpm. I'm not sure if it was in need of air or fuel. I could try a larger main jet if that might help? The hesitation/stuttering is only slight and at what feels like the top 10% of the rev range at WOT

Title: Re: Shortened air-filter pipe leads to sputtering
Post by DragBikeMike on 05/22/23 at 02:37:20

Thanks very much for the picture of your exhaust. I am gonna stick my neck out and say that your exhaust is not a hi-flow system. Any sort of baffle inserted in that straight pipe most likely plugs things up. But I've been wrong more than a time or two.

Can you remove the baffle and post several pictures so we can see all the features of the baffle (length, holes, flow path, etc.).

I suspect you have a stock header pipe with an extension attached. The stock header only has a 1.3" interior cross-section, it's pretty restrictive. The extension is most likely a 2" pipe to match the O.D. of the stock header. So, there isn't much volume to store spent gas while the baffle allows the pressure to bleed off.

While you have the baffle removed, it's time for another quick & dirty test.

Red Alert! Caution! Danger! Do not run the guts out of it with the air filter off and the baffle removed. A few simple WOT runs in 2nd gear will suffice. Do not go WOT in top gear and take it up to high speed.

With the air filter and baffle removed, run it up in first & second gear. See if the high-rpm stutter is gone. If it starts backfiring at high rpm, stop the test. Don't run it for a long time in this configuration; you will hurt it. Just run the test once or twice to determine if things improve.

Let us know how it goes.

Title: Re: Shortened air-filter pipe leads to sputtering
Post by DragBikeMike on 05/22/23 at 02:50:11

I believe you mentioned that you have a 4-speed transmission. That tells me you have one of the early LS650s. Model years 1986-1995 came from the factory with a #155 main jet. So, it seems like you have the stock main jet. That assumes no one has drilled out the main jet (very bad practice, don't do it).

You have the engine modified with cam & high-compression piston, and it has more displacement to boot. Wouldn't you agree that you probably don't need a smaller main jet.

All indications are indicative of a rich mixture. A super restrictive air filter will do that, and so will a plugged-up exhaust system. Marry those two things up and you have the perfect storm. The restrictive systems don't rule out other problems completely, but you've gotta get those two things corrected to have a fighting chance.

Regarding the K&N and Uni filters, they both fit the stock carb. You have to tighten the clamp quite a bit, but they fit good enough.

Title: Re: Shortened air-filter pipe leads to sputtering
Post by Moarpower on 05/22/23 at 03:30:01

Thanks Mike.
The baffle is welded at 2 points. I'll have to drill it out. I have opened the exhaust port quite a bit at the head. The exhaust was purchased from bluecollar bobbers before I got the bike.

Would running the bike with the baffles removed full time cause issues ? Or do you just mean not to do it long in combination with the lack of the filter.
I have a large automotive cone filter fitted now.

Title: Re: Shortened air-filter pipe leads to sputtering
Post by Moarpower on 05/22/23 at 03:38:18

The air intake was using a velocity stack on yesterday's run so it wasn't restricted when I was riding for 30 mins. And all it presented was the hesitation at wot and the top of the gears. Is that still going to be a rich condition? I thought they'd likely go lean at the top end?

I really just want this thing to run right. Seeing so many with cheap pod filters running perfect is frustrating ;D

Title: Re: Shortened air-filter pipe leads to sputtering
Post by Yoshi on 05/22/23 at 10:18:24

I am pretty sure your air filter is blocking that port, buy the one im posting, it’ll fit without trimming the stock airbox

Title: Re: Shortened air-filter pipe leads to sputtering
Post by Moarpower on 05/22/23 at 15:48:05

Port is clear. Running a velocity stack in the last effort and only had hesitation at the top of the rev range. I have a large filter to mount and it definitely not blocking the port.

Title: Re: Shortened air-filter pipe leads to sputtering
Post by DragBikeMike on 05/22/23 at 17:05:09

"The baffle is welded at 2 points. I'll have to drill it out. "

Please don't do that. It's just a quick & dirty test. I reviewed the vids on Blue Collar Bobbers website. The exhaust vid is second to last. That system uses the stock header with an extension to give it the drag pipe look. The extension is just glued on with silicone. All you have to do is pull the extension off and you accomplish the same thing as removing the baffle. It's not gonna run nice but it should be able to pull to max revs without stuttering and/or blubbering. Have you viewed that video? If not, you should view it.

"Would running the bike with the baffles removed full time cause issues ?"

Generally speaking, running with an open header is not ideal. If you have a cam with any overlap and TDC lift (i.e. the DR650 cam), an open header causes lots of exhaust reversion, so the carb is almost impossible to dial in at part throttle. It will work good at WOT high rpm, but it will cruise lousy. It is also anti-social and obnoxious. Don't run it like that. Just a test is OK; permanent not OK. Runs bad, sounds bad, is bad.

The stuttering, blubbering, misfiring & backfiring can be caused by overly rich or lean mixtures. In general, overly rich won't hurt it....but overly lean is another story. I can't say for sure if you are rich or lean, but running without the air filter, and with an open exhaust, and with more displacement, and more compression, and with a hotter cam should make it lean if you have a stock main jet (#155 for early model LS). As mentioned before, that assumes no one has drilled out that main jet. It also assumes your main air bleed is correct and not plugged. It also assumes your needle and needle jet are stock and the needle height is within acceptable limits (i.e. not pulling out of the needle jet). Generally, rich mixtures cause blubbering at WOT (your vid sounded that way to me, but it's a vid); lean mixtures cause high rpm backfiring, popping out the carb, and misfiring. Rich dull sound, lean sharp crackle.

How is your spark plug lookin now? Is it still black as coal? Rich mixture, black plug. Lean mixture, white plug.

Good clear pictures of all this stuff along with data regarding the markings on each component would be most helpful. A nice clear shot of your main airbleed illuminated would be nice. If you take that extension pipe off your exhaust, take photos with the baffle illuminated so we can see what that looks like. Pull the spark plug and post a photo of it now after you got it runnin better. It's very difficult to help you without photos.

Title: Re: Shortened air-filter pipe leads to sputtering
Post by Moarpower on 05/22/23 at 17:21:37

Thanks for the assignment, Mike. Ill get on that today :)

The previous owner had messed with the carb And he did drill out the 155 main jet but I have replaced it with another 155. I have bigger jets arriving this week in case they are needed.

The open header is extremely loud but ill give it a quick test.
I cleaned the carb again yesterday after running the velocity stack.

I notice when I disassemble the needle (which doesn't come out of the jet when all the way out) that the spring can easily push past the clip with minor wriggling. Maybe its not the factory spring? To prevent this I used the aftermarket needle with 3 setting, moved the clip to the top and added spacers that are slightly bigger. NOTE: I did this yesterday and have not run the bike with this yet.

I will order a whole new needle and clips/spacer. Maybe I should just try one of those Ebay carbs

Title: Re: Shortened air-filter pipe leads to sputtering
Post by verslagen1 on 05/22/23 at 18:59:39

I had a problem once and it turned out to be float height.

Title: Re: Shortened air-filter pipe leads to sputtering
Post by Moarpower on 05/22/23 at 19:31:49

Hey vers. How did you check it was the float height and what were the symptoms

Title: Re: Shortened air-filter pipe leads to sputtering
Post by Moarpower on 05/22/23 at 20:26:04

Here is a picture of the spark plug after about 90kms with the velocity stack.

Title: Re: Shortened air-filter pipe leads to sputtering
Post by Moarpower on 05/22/23 at 20:26:49

Here is the best I could with slip on pipe baffle image

Title: Re: Shortened air-filter pipe leads to sputtering
Post by Moarpower on 05/22/23 at 20:28:23

And another .
It looks like a 12 inch baffle. Bigger than I thought originally.
Maybe I should just get rid of the baffle while I source the new exhaust setup and make a header?

Title: Re: Shortened air-filter pipe leads to sputtering
Post by Moarpower on 05/22/23 at 20:30:00

The baffle length is marked in red. Maybe more like 14 to 15 inches

Title: Re: Shortened air-filter pipe leads to sputtering
Post by Moarpower on 05/22/23 at 21:55:35

Going to give this a try.

Title: Re: Shortened air-filter pipe leads to sputtering
Post by verslagen1 on 05/22/23 at 22:09:54

71535D4E4C534B594E3C0 wrote:

Hey vers. How did you check it was the float height and what were the symptoms

http://suzukisavage.com/cgi-bin/YaBB.pl?num=1367212825

Title: Re: Shortened air-filter pipe leads to sputtering
Post by Moarpower on 05/23/23 at 00:37:11

Ok, a quick and dirty test with no intake and open header seemed to rev out well in 2nd gear. I didn't do it much, just 3 or 4 pulls. Bur it was responsive.

I tried with the large air filter shown above and again, the hesitation that was present at the top end was back. I found it was improved when I'd roll on the throttle to wot. It wasn't until after the run that I remembered that I swapped out the needle late last night for the aftermarket one with 3 clip settings to see if it would exit the slide jet. . Idiot. Total waste of an afternoon.
Tomorrow morning I'll use the stock needle with a single clip setting, and the washers to match the original spacer. And report back. It definitely smelled rich with the needle I was using today.

Title: Re: Shortened air-filter pipe leads to sputtering
Post by DragBikeMike on 05/23/23 at 03:52:00

Once again, you are making too many changes all at once. I know it's a pain in the tusch to take everything apart just to change or adjust the slide needle, but you have to grin and bear it. Installing the bigger filter and a different slide needle and changing the needle position all at once doesn't help you. Only one change at a time.

Caution!!! Your spark plug is bone white after 56 miles of riding. White equals lean. Be careful or you will hurt it.

You definitely have enough air filter now. That should be sufficient, but how do you know that the oval vent port is not obstructed? I assume you have a short section of PVC pipe in the female socket of that elbow. What schedule is the pipe? What is the wall thickness? How did you verify that it doesn't obstruct the vent port?

Title: Re: Shortened air-filter pipe leads to sputtering
Post by DragBikeMike on 05/23/23 at 03:55:56

"I notice when I disassemble the needle (which doesn't come out of the jet when all the way out) that the spring can easily push past the clip with minor wriggling. Maybe its not the factory spring? "

I can see from your picture that you are missing a washer. The washer prevents the spring from slipping over the e-Clip. The washer goes between the spring and e-Clip. When the spring slips over the e-Clip, the needle is allowed to move down, which will make your mixture lean. Since the needle is no longer captured, and can move around, the mixture becomes a moving target. You must fix this. I posted the correct assembly sequence in this thread.

Title: Re: Shortened air-filter pipe leads to sputtering
Post by DragBikeMike on 05/23/23 at 04:00:15

See the washer?

Title: Re: Shortened air-filter pipe leads to sputtering
Post by Moarpower on 05/23/23 at 04:15:06

Thanks Mike.

Yes I made too many changes.

I have a suitable washer that I'll use on the needle. That image without the washer is how the slide needle was when I pulled it apart for the first time. I'll try to use just the washer and plastic spacer and see if I can make it work while I wait for more a replacement spacer.

That image of the plug was taken after the velocity stack run so it would have had too much air for sure.

The oval port is definitely not blocked with this airfilter. To test it out I heated a piece of PVC to fit over the carb intake and then cooled it. It takes some effort to remove. It extends about a half inch past the intake edge/oval port and the other PVC is fitted to that. So it's impossible for it to be blocked.
It's sealed and clamped but is only temporary until the k&n filter arrives.

I am unsure of the schedule. I just grabbed what they had at the hardware store here. It's pretty thick pipe but as it's only temporary I didn't really look into it.

Tomorrow morning I'll reset the needle and see how it goes. I definitely think its lean at WOT.

Title: Re: Shortened air-filter pipe leads to sputtering
Post by DragBikeMike on 05/23/23 at 04:23:54

I'm kinda glad you mentioned the spring problem because it prompted me to blow up your photo. Once blown up, I can see your OEM needle is a 5C17. Very valuable info.

The 5C17 needle is for the late model carbs. It should be run with a X-7 needle jet, but the early model carbs came with a X-8 needle jet.

The late model carbs have a fixed main air bleed. It's about .024". I've never measured the main air bleed on an early model carb. The main air bleed and needle jet work together. They're a team. If the early model carb has a different size needle jet, it might also have a different size main air bleed. Do you see where this is goin?

In order to help you, we need to know everything about your carburetor. We need to know what the markings are on your needle jet. We need to know if it's brass or stainless steel. We need to know the size of your main air bleed.

Don't use anything that doesn't have a clear marking embossed. That rules out any of the stuff you got in a carb kit. Don't use it. You know nothing about it. You don't know the size, taper, etc. Mixing the aftermarket junk in with genuine OEM parts isn't gonna work.

Needle jet must have a clear marking. What is it? If it doesn't have a clear marking, don't use it.

Slide needle must have a clear marking. You have several needles. What are the markings? I can see one is a 5C17, what are the others? If it doesn't have a clear marking, don't use it.

Main air bleed. How big is it? Use small numbered drills to check it. Insert the shank side of the drill bit, not the pointed side. If you don't have numbered drill bits, get some. They are available at any decent hobby shop. If you have no other choice, take the carb to your local machine shop. They will probably measure the thing for free.

You have this chop suey conglomeration of parts and you are wasting time constantly disassembling and reassembling without keeping any records of the parts. You should have a complete, detailed list of all the parts by now. Just zoom in with your phone and snap a photo of the markings, then transcribe the info onto a piece of paper.

Title: Re: Shortened air-filter pipe leads to sputtering
Post by DragBikeMike on 05/23/23 at 04:39:54

Thanks for the photos of the exhaust pipe. It looks pretty restrictive.

Can you believe that those little holes in your baffle are supposed to handle 40 cubic inches of red-hot exhaust gas traveling at the speed of sound about 3000 times per minute? I think that baffle thing is super restrictive, but it's probably not the source of your stuttering. It's a crime to put that thing on a hopped-up motor. Can you tell how many of those perforated plates are in that five-inch section? Can you tell if they all have a similar number & size of holes?

I suspect the bobber kit is a form over function affair. You want a certain look, and the wrapped straight pipe fits the bill. Once you get this stuttering thing figured out, you might wanna consider something like this. It's cheap. Can be modified to be very quiet. And...IMO...lends itself to the classic bobber look. It flows half decent too.

Title: Re: Shortened air-filter pipe leads to sputtering
Post by Moarpower on 05/23/23 at 05:04:19

Thanks Mike. I believe there are about 4 or 5 of those disks with holes but could be more and I can't tell if there is another form of baffle in the middle of it all.

I was wondering if the stock header pipe is dual walled. And if so would.i be able to remove the inner pipe and use the outer only? Obviously I'd have to cut and weld. Maybe it would be too open then .
The cherry bomb look cool. Are there any videos of something like that running ?

Title: Re: Shortened air-filter pipe leads to sputtering
Post by Ruttly on 05/23/23 at 11:47:26

Love the cherry bomb

Must be loud

Title: Re: Shortened air-filter pipe leads to sputtering
Post by Moarpower on 05/23/23 at 18:57:28

Here is a shot of the main air bleed. I will get some small drill bits today if I can find them locally.

Title: Re: Shortened air-filter pipe leads to sputtering
Post by Moarpower on 05/23/23 at 18:58:13

The brass needle jet is numbered

X-6

Title: Re: Shortened air-filter pipe leads to sputtering
Post by DragBikeMike on 05/24/23 at 03:38:28

Progress. Thanks for those pics of the air bleed and needle jet. So, now we know you have a 5C17 needle, X-6 needle jet, and a main air bleed that is fairly small (it looks similar to mine but a measurement is in order). Very interesting info.

The parts fiche shows that the US Models came with a 5C16 needle and a X-8 needle jet from 1986 through 1995. Then, from 1996 through 2019 the US models were delivered with a 5C39 needle and a X-7 needle jet.

There are some confusing aspects to the fiche in that the needles are identified as 5C39 from 1996 through 2009, and are identified as 5C17 from 2011 through 2017, and not identified at all for 2018 & 2019. But all of the needles from 1996 through 2019 have exactly the same part number (13383-24C40). I have one of those needles hermetically sealed in the original plastic package, and it has a genuine Suzuki label with the part number 13383-24C40. You can clearly see 5C39 embossed on the needle. So, the US delivered early models used a 5C16 needle, and the late models used a 5C39 needle.

The only difference between the 5C16 and the 5C39 is the number of grooves for the eClip. The 5C16 has three grooves, the 5C39 has only one groove. The tapers and diameters are the same.

Since it appears that the 5C17 and the 5C39 are the same (they have the same part number), I'm gonna take a leap of faith and say your 5C17 needle is essentially the same as my 5C39.

Now the interesting part. Mikuni needle jets are identified by a letter followed by a number. The numbers range in size from 0 to 9. Zero being the smallest in that jet configuration, and 9 being the largest. You X-6 designation indicates that your needle jet is one size smaller than a late model US LS650, and two sizes smaller than an early model US LS650. On the US bikes, they leaned out the jetting on the late models, but your early model has a leaner setup than a US late model. That seems odd.

Is there any chance that your carb, or the parts currently in your carb, are from a LS400?

If your main air bleed is .024", I suggest you procure a needle jet for a late model US LS650. You want part number 09494-00861. Use that needle jet in conjunction with your 5C17 needle, or procure a new 5C39 needle, part number 13383-24C40. Using the X-6 needle jet you currently have will only aggravate what looks like a lean condition. Your plug is really white.

Title: Re: Shortened air-filter pipe leads to sputtering
Post by DragBikeMike on 05/24/23 at 03:48:34

You are in Australia. Do I have that correct?

I have seen several posts on this forum pertaining to either Australia or New Zealand, where the LS carbs were found with slide limiters. The bikes were delivered with these plastic tubes that prevented the slide from lifting all the way. Seemed as if someone was trying to limit top speed and power. Those carbs might have been delivered with a X-6 needle jet. I tried to find a parts fiche for a LS400, but I'm just not skilled enough with Google. Anyone have any idea what this X-6 needle jet is all about? Anyone able to access a parts fiche for the LS400? Anyone know what needle jet the LS400 used?

This is a picture of one of those slide limiters.

Title: Re: Shortened air-filter pipe leads to sputtering
Post by DragBikeMike on 05/24/23 at 03:50:34

This shows how the limiter stops the slide from lifting all the way.

Title: Re: Shortened air-filter pipe leads to sputtering
Post by DragBikeMike on 05/24/23 at 04:05:24

Regarding the Cherry Bomb, I don't have an actual vid of the modified muffler, but I do have a vid of how the muffler effectively attenuates the sound. I placed the Cherry Bomb over the outlet of a Mac Muffler. The Mac muffler is a straight through design with a louvered steel baffle. No glass wool, just a louvered baffle. It's an obnoxious muffler. Placing the Cherry Bomb over the end of the Mac muffler really reduced the noise. It filtered out most of the high-frequency rat-tat-tat.

https://www.youtube.com/watch?v=_U91BRWUc6s

I thought it sounded pretty good, so I made a baffle for the Cherry Bomb just to see how good it might work. With the baffle, the air flow was about the same as a Harley Dyna muffler. It had a nice mellow sound and was quiet. The sound was similar to the recording above, but a bit less volume.

This gives you an idea of how the baffle fits in the muffler. The design is scaled down version of the LCGP mufflers I've been running.

Title: Re: Shortened air-filter pipe leads to sputtering
Post by Moarpower on 05/24/23 at 17:35:23

Rode 300kms. Only minore puttering and hesitation at high revs again. Stock needle reinstalled.

Bike reached 140kmph easily. A couple of little rich running moments as I could smell it. Maybe the needle got stuck due to the crappy broken spacer. Got 240kms out of a tank.

Here is the plug

Title: Re: Shortened air-filter pipe leads to sputtering
Post by Moarpower on 05/24/23 at 17:36:37

Another angle.
Most of the soot on the inside is from using the other needle the other day. It was running very rich then and I just wiped off the electrode portion before the big ride.

Title: Re: Shortened air-filter pipe leads to sputtering
Post by Moarpower on 05/26/23 at 15:40:22

So the bike did a total of 720kms over 2 days. It ran really good
Will need to buy a new needle for the jet. I will also try a bigger main jet this week.

Title: Re: Shortened air-filter pipe leads to sputtering
Post by Yoshi on 05/28/23 at 03:34:00

00222C3F3D223A283F4D0 wrote:

First I just cut away material from the filter, then I changed it used a larger silicon tube on the carb, put a piece of pipe into that that cleared the hole, and then clamped the filter to the pipe.

Cutting away the rubber material will stick obstruct flow, get the correct filter!

Title: Re: Shortened air-filter pipe leads to sputtering
Post by Moarpower on 05/28/23 at 03:51:27

I took Dragbikemikes advice on what filter to get. The one you are trolling me about on Facebook is too small. I tried it and it bogged down bad.
Like I said earlier, I have a hard PVC sleeve over my carb intake. It is impossible for me to block my oval port. The bikes running extremely well now. Just need to fine tune the jet sizing. Have done 900kms since Saturday

Title: Re: Shortened air-filter pipe leads to sputtering
Post by Yoshi on 05/28/23 at 04:27:20

Many of us run the RC-1250 air filter, it’s been proven to work.
Fix it right the first time around

Title: Re: Shortened air-filter pipe leads to sputtering
Post by Yoshi on 05/28/23 at 04:39:51

I had over 15 Savages, listen to me

Title: Re: Shortened air-filter pipe leads to sputtering
Post by Moarpower on 05/28/23 at 04:42:26

71607148444A4053524A48210 wrote:

I had over 15 Savages, listen to me

It wouldn't matter if you designed the savage for Suzuki. DBMs advice on the larger filter solved my issue so I don't need to use your suggested, smaller filter at this stage. I paid 40 AUD for the 1250 and it didn't do the trick. Went with a much larger one and my bogging issues are now gone. I'm sorry.im not sure why you think I need to go down in filter size. Can you explain ?