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Message started by hawk41 on 07/06/16 at 10:38:17

Title: Re-jetting after Harley Muffler install
Post by hawk41 on 07/06/16 at 10:38:17

Before I try to change the jets after my recent Harley muffler install I would like to know how many turns out on the idle mixture screw is stock. At 1.5 turns to 2.5 turns I really can't tell much difference in the idle, however, when riding there seems to be more backfires at 1.5 than at 2.5. Suggestions would be appreciated. :)

Title: Re: Re-jetting after Harley Muffler install
Post by Dave on 07/06/16 at 11:58:56

In order to properly set the idle mixture screw, you may need to turn the idle speed down a little bit....down to around 800 rpm. This is lower than recommended for a healthy cam (low oil pressure at low idle speeds) - but at 1,000 - 1,100 rpm some fuel begins to flow out of the needle jet and makes adjusting the idle fuel mixture impossible. Start at 1.5 turns out and then adjust. If you can turn the screw all the way in without the engine dying - the pilot jet is too big.....and if you have to turn the screw out more than 2.5 turns the idle jet is too small. Don't let the engine lean over on the side stand while you are making the adjustment....hold the bike upright so the cam is oiled properly. Then turn the idle speed back up when you are done. And you can open the mixture screw up a 1/8th turn or so extra to help reduce the backfire - but you really should be jetting for a bike that runs properly when the throttle is open, and ignore what it does when the throttle is closed.

https://www.youtube.com/watch?v=YxpQjDQzX7g

https://www.youtube.com/watch?v=zm5mB3R8Ucw

Title: Re: Re-jetting after Harley Muffler install
Post by hawk41 on 07/06/16 at 12:42:31

Thanks for the info! Results are as follows:
1.5 turns - backfires a lot while throttling up
.75 turns - engine dies
2.5 turns - While underway, rolling the throttle off gently to shift, pretty loud backfire almost every shift.

Does this indicate the idle jet is too small? How many sizes up should I go or is that just trail & error.

Is this a typical change when you go to a Harley muffler? Thanks! :-?

Title: Re: Re-jetting after Harley Muffler install
Post by verslagen1 on 07/06/16 at 13:08:22

4940564A1510210 wrote:

2.5 turns - While underway, rolling the throttle off gently to shift, pretty loud backfire almost every shift.

You need to double check for exhaust leak.

Also, does the HD muff have the straight thru baffle intact?

After you're sure about these Q's, then I'd up size the pilot.

Title: Re: Re-jetting after Harley Muffler install
Post by hawk41 on 07/06/16 at 13:14:09

New exhaust gasket and torqued to specs.

Bought the HD muffler here on SuzukiSavage.com and it has the straight thru baffle.

When sizing up, should I purchase several diff. sizes and experiment?

Thanks! :)

Title: Re: Re-jetting after Harley Muffler install
Post by Kris01 on 07/06/16 at 16:57:16

What jets are you currently using?

Title: Re: Re-jetting after Harley Muffler install
Post by hawk41 on 07/06/16 at 17:04:00

Don't know yet! Have to study how to remove it! Am I correct in assuming there is only one pilot jet. I am sure there are instructions here on SuzukiSavage.com on the procedure for removal. Just need to find the correct thread. I will post the jet size once I get my hands on it. :-/

Title: Re: Re-jetting after Harley Muffler install
Post by Kris01 on 07/06/16 at 17:12:40

Yes, 1 pilot jet, 1 main jet. You'll also want to shim the jet needle. It controls about 1/4-3/4 throttle. That's where you'll spend most of your time.

http://suzukisavage.com/cgi-bin/YaBB.pl?board=tech;action=display;num=1098869040

http://suzukisavage.com/cgi-bin/YaBB.pl?board=tech;action=display;num=1157720585

http://suzukisavage.com/cgi-bin/YaBB.pl?num=1309246277

http://suzukisavage.com/cgi-bin/YaBB.pl?num=1221818822/0#0

http://suzukisavage.com/cgi-bin/YaBB.pl?num=1350749896/0

Title: Re: Re-jetting after Harley Muffler install
Post by hawk41 on 07/06/16 at 18:45:48

Thanks! Is there a particular size of shim that I need to buy? It does sound from reading the links that you provided that I probably just need to get the next jet size up. It will be interesting to see if the previous owner has changed the factory jet as the plug over the idle screw had already been removed. Just need to find out how to remove the pilot jet and shim the jet needle! :-/

Title: Re: Re-jetting after Harley Muffler install
Post by Kris01 on 07/06/16 at 20:07:11

3 #4 brass washers should do the trick! That's about 2/3 the thickness of the original nylon shim. You can find these washers at larger home improvement stores (Home Depot, Lowes, etc) or you can contact Lancer. He sells a kit that has everything you need. ;)

The original owner of mine had drilled out the pilot screw plug but it still had the stock jets.

Lancer's jet kit:
http://suzukisavage.com/cgi-bin/YaBB.pl?num=1336741909

Title: Re: Re-jetting after Harley Muffler install
Post by zipidachimp on 07/06/16 at 23:02:32

At sea level, Dyna muff, white spacer 1/2 thickness, pilot 55, main 155, my bike has become a rocket, 95% no backfires! Woohoo! 8-)

Title: Re: Re-jetting after Harley Muffler install
Post by hawk41 on 07/06/16 at 23:11:10

Nothing about carbs makes sense to me (sh*t, life doesn't make sense to me but what else is new)! So! Are you saying that the shim needs to be "less" in size than the original. "Shims" are supposed to be make something bigger,right? I think it's time for another Gin & tonic! ;D

Title: Re: Re-jetting after Harley Muffler install
Post by Dave on 07/07/16 at 03:52:09

272E38247B7E4F0 wrote:

Bought the HD muffler here on SuzukiSavage.com and it has the straight thru baffle.
:)

Does that mean you can see straight through the muffler....if you look into one end can you see daylight coming from the other end?

Title: Re: Re-jetting after Harley Muffler install
Post by hawk41 on 07/07/16 at 06:32:00

Yep! Can see straight thru. How do I get access to the pilot jet, etc.? Do I have to remove the carb or can I do it on the bike? :-[

Title: Re: Re-jetting after Harley Muffler install
Post by Dave on 07/07/16 at 06:53:56

[quote author=5E57415D0207360 link=1467826697/0#13 date=1467898320]Yep! Can see straight thru. How do I get access to the pilot jet, etc.? Do I have to remove the carb or can I do it on the bike? :-[/quote]

Well....that is part of your problem. Somebody has knocked the little plate out of the baffle - you should not be able to see straight through the muffler. Halfway down the muffler there is supposed to be a little metal plug - it forces the exhaust to go out the holes into the outer shell, then on the backside of the plug the exhaust comes out of the outer shell and back into the center pipe.....the out the back. Without that plug in the center you don't have a "muffler"....you have a "straight pipe" or "drag pipe". You will never be able to jet your carb to stop the backfiring and noise when the exhaust just goes through a straight pipe.

Title: Re: Re-jetting after Harley Muffler install
Post by batman on 07/07/16 at 09:38:30

Before you panic you can replace the missing baffle .Buy a 1 1/4 inch freeze plug (any auto parts store) and drive it halfway down the the muffler this returns it to stock ,making it easy to tune the carb.

Title: Re: Re-jetting after Harley Muffler install
Post by hawk41 on 07/07/16 at 09:53:58

Thanks for the tip! Before I do any modifications to the muffler I have sent a message to the party that I purchased it from asking for his advice on re-jetting as he has sold many of these mufflers here on this forum. :-/

Title: Re: Re-jetting after Harley Muffler install
Post by Kris01 on 07/07/16 at 19:38:38

3E2D342D2025272C2D2934440 wrote:

At sea level, Dyna muff, white spacer 1/2 thickness, pilot 55, main 155, my bike has become a rocket, 95% no backfires! Woohoo! 8-)

You may be running rich. See my signature. I'm about 300-350' ASL.

Title: Re: Re-jetting after Harley Muffler install
Post by batman on 07/07/16 at 20:34:12

Using 2/3 washers on the needle lifts it making it run richer. If you can insert a broom handle more than a couple of feet up your muffler you have no baffle.

Title: Re: Re-jetting after Harley Muffler install
Post by hawk41 on 07/08/16 at 09:21:05

Well! It turns out that my muffler is a "Screaming Eagle" w/no baffle, just a straight thru muffler. Question? How can it be called a "muffler" if it has no baffle and does not "muffle"? Just askin'! So! Should I start a new "thread" asking if anyone knows how to jet for a "Screaming Eagle" muffler?

Title: Re: Re-jetting after Harley Muffler install
Post by Dave on 07/08/16 at 09:28:59

2C25332F7075440 wrote:

Although you may be able to get your jetting for the bike to run OK with a straight through pipe....there is no possible way to change jetting to keep a pipe like that from backfiring.

Why do you think it is called a "Screaming Eagle"?
If there isn't anything inside to muffle....it is not a muffler!

Title: Re: Re-jetting after Harley Muffler install
Post by hawk41 on 07/08/16 at 09:35:07

Since this so called "muffler" was not designed with a baffle, is there a way to add some type of baffle to the muffler that will allow the carb. to be tuned to minimize the backfire?

Title: Re: Re-jetting after Harley Muffler install
Post by justin_o_guy2 on 07/08/16 at 09:37:10

Get a Dyna muffler and get on with riding. The Dyna looks good, sounds good, small bump in power over stock and easy to jet. And they are cheap and easy to get. Lots of New Harleys get ridden straight to a shop to be customized. Twenty bucks is a common price. Just avoid the catalytic converters and the crossover tubes.

Title: Re: Re-jetting after Harley Muffler install
Post by Dave on 07/08/16 at 09:41:06

636A7C603F3A0B0 wrote:

Since this so called "muffler" was not designed with a baffle, is there a way to add some type of baffle to the muffler that will allow the carb. to be tuned to minimize the backfire?

Maybe......I don't know what this muffler looks like inside (other than I expect it might be a hollow tube).

Title: Re: Re-jetting after Harley Muffler install
Post by hawk41 on 07/08/16 at 09:56:40

Yes! Straight thru and a broom handle goes all the way thru with no problem. One member suggested a 1 1/4 inch freeze plug inserted to about half way but my concern would be that the original design does not have anywhere for the exhaust gas to go if the pipe is blocked. It's beginning to look like a poor purchase decision. Maybe my best bet would be to put it on Craigs List to salvage some of the purchase price and hunt down a reasonable priced Dyno.

Title: Re: Re-jetting after Harley Muffler install
Post by Dave on 07/08/16 at 10:04:50

3831273B6461500 wrote:

One member suggested a 1 1/4 inch freeze plug inserted to about half way but my concern would be that the original design does not have anywhere for the exhaust gas to go if the pipe is blocked.

That suggestion was made when you were telling us that you had a Harley DYNA muffler.....and it does not apply to your Screaming Eagle. Some folks knock out the little plug in the DYNA to make is straight through, and if they do that you can replace it with a freeze plug.

Title: Re: Re-jetting after Harley Muffler install
Post by justin_o_guy2 on 07/08/16 at 12:07:31

Dude, do you Have twenty bucks? Get a Real Dyna muffler and ride. Sell that thing you got when it is handy.. Way more drama than necessary. Solve the problem, it's Easy.. then see about recouping the losses.

Craig's list is Great, except for when it Isn't..
Call around, see if anyone in town has a Dyna, try to Not get breathless if they say they do. Ask if it's a New take off. Don't tell anyone you want it for a rice burner. You scraped one up,don't Have to have one, but it would be good..
Some Harley places are crappy about the Japanese bikes.
Palpable Need can be expensive.

Title: Re: Re-jetting after Harley Muffler install
Post by hawk41 on 07/08/16 at 13:02:15

Nothing on Craigs List at this time. The local Phoenix bike salvage yard doesn't do Harley's. Called the local Harley shops but they say they do not sell the old muffler take-offs. PayPal and I are in an ongoing pis*ing match so eBay is out (they are pretty expensive anyway). Probably my best bet is to put my stock muffler back on so I can ride while I try to find a Dyna. Want to thank all you forum member who have taken your time to try and help me with this problem. Terry 8-)

Title: Re: Re-jetting after Harley Muffler install
Post by batman on 07/08/16 at 13:25:26

If the Harley guys don't sell them ,what do they do eat them ?maybe you could do some dumpster diving! ;) :)

Title: Re: Re-jetting after Harley Muffler install
Post by hawk41 on 07/08/16 at 13:28:57

I don't know! Some of them look like they could chew one up and spit it out like chewin' tabacco. ;D

Title: Re: Re-jetting after Harley Muffler install
Post by justin_o_guy2 on 07/08/16 at 13:33:15

Called the local Harley shops but they say they do not sell the old muffler take-offs.

Well,, stupid happens..
Slip in, walk around, talk to the janitor..

Call Other shops,, trust me, there Is a shop that works on Harley s. Besides the dealer. Or you don't have more than ten stop lights.

We don't sell the take offs,, HA! Bet your butt they wind up in the scrap yard.. Call the recycling center, see if they have a clue,, naah, better to Go than call..
Check the Marketplace on this f o rum.

Title: Re: Re-jetting after Harley Muffler install
Post by verslagen1 on 07/08/16 at 13:40:47

1st don't tell them you're gonna use it on a metric bike.
tell'm your dad is stuck somewhere and you need to take him a replacement.
somewhere=anywhere there's not a HD dealership for a 100 miles.

Title: Re: Re-jetting after Harley Muffler install
Post by hawk41 on 07/08/16 at 13:44:29

The first shop I called wanted to know the year of the bike! I guessed a 2000 model but knowing which year the rail attachment model was standard would probably make my story better! :-/

Title: Re: Re-jetting after Harley Muffler install
Post by hawk41 on 07/08/16 at 14:07:48

Since I will be 75 in a couple of months, the "dad stuck somewhere" story probably won't fly! LOL

Title: Re: Re-jetting after Harley Muffler install
Post by justin_o_guy2 on 07/08/16 at 14:13:41

Yeah, you might hafta hire someone,, or maybe get a grandchild to do it.. Dude you seriously need to be riding.. can't Believe those jerks won't sell you one..
I would pretend like I never called, walk in, it's your sons birthday coming up, he Needs a Dyns sent to Ohio, whatever,,

Title: Re: Re-jetting after Harley Muffler install
Post by hawk41 on 07/08/16 at 14:15:18

I like that "story" better! Thanks! :)

Title: Re: Re-jetting after Harley Muffler install
Post by verslagen1 on 07/08/16 at 20:42:03

2920362A7570410 wrote:

Since I will be 75 in a couple of months, the "dad stuck somewhere" story probably won't fly! LOL

hell, why won't that work, tell 'em he's 98 and they'll probably give them to you. 8-)

Title: Re: Re-jetting after Harley Muffler install
Post by zipidachimp on 07/08/16 at 21:05:18

Dyna muffs are a 'dime-a-dozen' on Ebay. Choose the right one and stock up! 8-)

Title: Re: Re-jetting after Harley Muffler install
Post by cheapnewb24 on 07/08/16 at 22:01:25

4C45534F1015240 wrote:

The idea is to lift the slide needle in order to let in more gas through the main/needle jet complex. With the Savage, this is traditionally done by reducing the size/number of shims. Now that I'm working on my Dad's Honda Shadow, I'm actually in the process of adding shims to achieve the same effect. Is your head exploding yet? ;D

I believe the difference is specifically where on the needle you add the shims.

If the carb has never been worked on, you'll do well with the needle shim (white spacer) mod as well as the main and idle jet adjustment. Let no one fool you, the white spacer mod will make a huge difference . Changing the main jet alone won't fix everything, nor will messing with the idle mixture. You need to do all three. I have 3 washers, with a 150 main, and the idle mixture adjusted to whatever. I have stock setup. I may be running a slightly rich, but it does okay. It runs smoothly but pops a bit on decel. I live around 1500 feet alt. My setup is considered a good starting point for the dyna muffler. I'd say Serowbot would agree. You'll probably lose a bit of gas mileage. You may have to play with it till you get it where you want it.

Another question: Can you turn the idle mixture out until the engine slows down? Go for the mid-point--the sweet spot between being rich enough to slow the engine or lean enough to slow it. Turn the screw back and forth like a slow pendulum until it slows down in each direction until you find the happy middle. The number of turns is partly academic. It helps us understand. What matters is that it is at the point where it runs right, regardless of whether you've counted turns or not. One important thing, though is that you stay within a certain range of turns. On the Savage, going more than three turns out becomes less productive and risks losing the screw. You don't want to have to jam the screw either in the other direction in order to find the best place. Find the sweet spot. If it crosses the three turn mark, you might as well just get a little bigger jet, at least if you can spare a few dollars.

Let's say that you turn the mixture screws every-which-way and it still doesn't run right... You might have the wrong size pilot. Or... you might have other problems... But, of course, that may not apply to you. ;)

Title: Re: Re-jetting after Harley Muffler install
Post by hawk41 on 07/08/16 at 22:17:29

I guess what is confusing to me is that to my pea size brain, a backfire is caused by unburned fuel igniting in the exhaust pipe so if you jet the carb to run richer (that's more fuel, right) then you just make matters worse. However, I obviously have my head up my tushy, as all the instructions are to raise the needle and probably put in a larger pilot jet to make it run richer. Oh Well! It really is not all that important that I understand why it works, I will just do it when I get a better muffler. But right now, it's time for another Gin & tonic. Cheers! 8-)

Title: Re: Re-jetting after Harley Muffler install
Post by cheapnewb24 on 07/08/16 at 22:24:53

03080501100E0517025254600 wrote:

[quote author=4C45534F1015240 link=1467826697/0#11 date=1467871870]Nothing about carbs makes sense to me (sh*t, life doesn't make sense to me but what else is new)! So! Are you saying that the shim needs to be "less" in size than the original. "Shims" are supposed to be make something bigger,right? I think it's time for another Gin & tonic! ;D

Title: Re: Re-jetting after Harley Muffler install
Post by Dave on 07/09/16 at 04:30:11

2821372B7471400 wrote:

The reason the unburned fuel makes it into the exhaust.....is that the mixture has become so lean that it cannot be ignited in the cylinder by the spark plug - but it can be ignited by the hot exhaust pipe. It also happens that a lean mixture with a lot of oxygen explodes more violently in the exhaust system than a mixture with less available oxygen - so the explosion is less violent when the mixture is richer.

The lean situation occurs when you have the engine at speeds above idle, and you allow the throttle to close completely when you shift, or when slowing down. The closed throttle creates a very high engine vacuum that pulls a lot of air into the engine - but the closed throttle makes the carb close all the fuel circuits except for the idle circuit....and it just can't provide enough fuel when the engine is slowing down with the throttle closed.

WARNING - You need to jet your bike so that it runs properly when you are acceleratinng and running at a steady speed - you should not be jetting your bike so it doesn't backfire or pop. Jetting changes for the closed throttle position don't make a good running and economical engine. You need to adapt your right wrist to avoid closing the throttle completely as you shift gears - and when you are slowing down. If you keep the throttle open just a tiny bit - the noise will be reduced considerably. When slowing down you just roll the throttle slightly open and you will hear the popping and backfiring go away - but don't use so much throttle that the bike is accelerating.

The backfire (afterfire) on shutdown occurs because you have turned off the ignition and the engine is still turning as it comes to a stop....and it is still pulling air through the carb, picking up fuel, and then pumping it into the hot exhaust as the engine comes to a stop. When that unburned fair/fuel build up in the hot exhaust system it becomes hot, reaches the flash point, and explodes. The stock muffler does a good job of baffling the explosion - but when you install a less restrictive muffler the explosion is less contained. The air/fuel mixture once again can affect the loudness of the explosion, and a lean mixture explodes more violently. The fuel/air mixture at idle is controlled by the idle mixture screw - and once again you need to adjust the screw so the engine runs correctly, and not so that it doesn't backfire. Allowing a few seconds of idle before you shut the engine down can help to reduce the chance of a backfire at shutdown.

Title: Re: Re-jetting after Harley Muffler install
Post by hawk41 on 07/09/16 at 05:51:00

Thanks for the explanation. Now I understand how it works. Before I change out my Screaming Eagle non-muffler I will see if I can get it to run more smoothly and practice rolling the throttle differently. No luck so far finding a take off Dyna anyway.

Title: Re: Re-jetting after Harley Muffler install
Post by justin_o_guy2 on 07/09/16 at 06:10:37

Rowboat,, he's over your way,,can you locate anything for him?

Title: Re: Re-jetting after Harley Muffler install
Post by hawk41 on 07/09/16 at 08:57:51

Screaming Eagle is history! Too much trouble! It's heading for Craigs List. Re-installed my slightly modified stock muffler and at 2.5 turns it appears to run fairly well. At least it's rideable until I find a Dyna. Question? How many times can you remove the header pipe and re-install it before you replace the exhaust gasket. :-/

Title: Re: Re-jetting after Harley Muffler install
Post by justin_o_guy2 on 07/09/16 at 09:15:58

Until it rips. Every time pulled mine I gently stretched it. Had it out at least three times, never replaced.

Title: Re: Re-jetting after Harley Muffler install
Post by cheapnewb24 on 07/09/16 at 09:29:47

203324253A3731333867560 wrote:

1st don't tell them you're gonna use it on a metric bike.
tell'm your dad is stuck somewhere and you need to take him a replacement.
somewhere=anywhere there's not a HD dealership for a 100 miles.

Hmmm.... Maybe that's why I could never get the dealerships to sell me a takeoff muffler. I tended to tell them what it was for. I think they would claim that they didn't have any.

They should be easier to find on EBay anyway.

Title: Re: Re-jetting after Harley Muffler install
Post by Kris01 on 07/09/16 at 11:50:20

I think my Dyna says not to install on any other application than a HD Dyna! ;D

Title: Re: Re-jetting after Harley Muffler install
Post by justin_o_guy2 on 07/09/16 at 11:58:27

That's just a legal thing. Harleys lawyers told them to do that. That way when someone installs one a bike that had previously not leaked oil and suddenly starts hemorrhaging oil when it is installed then they can't sue.

Title: Re: Re-jetting after Harley Muffler install
Post by Kris01 on 07/09/16 at 12:01:57

LOL! Pretty funny! ;D

Title: Re: Re-jetting after Harley Muffler install
Post by cheapnewb24 on 07/09/16 at 12:08:10

I'd say it's partly an EPA emissions/sound thing.

Title: Re: Re-jetting after Harley Muffler install
Post by hawk41 on 07/09/16 at 14:02:49

Update! Finally found a take - off Dyna on Craigs list! Would try to install it this afternoon but it's about 105 degrees in my garage so it will have to wait til' morning when it cools down to 85. :o

Title: Re: Re-jetting after Harley Muffler install
Post by justin_o_guy2 on 07/09/16 at 14:23:42

That's great news!

Title: Re: Re-jetting after Harley Muffler install
Post by hawk41 on 07/09/16 at 14:27:32

So! To change the needle spacer I have to remove the gas tank, right? :-/

Title: Re: Re-jetting after Harley Muffler install
Post by cheapnewb24 on 07/09/16 at 15:31:22

Meh... That aint hard. Turn the petcock off, remove front seat, unbolt, and lift away. You may need to disconnect the speedometer cable (easy just don't get dirt in there), the fuel line, and some electrical stuff.

Whatever you do, be careful not to strip the carb screws. They can be tough.

Title: Re: Re-jetting after Harley Muffler install
Post by verslagen1 on 07/09/16 at 15:35:38

yes

Title: Re: Re-jetting after Harley Muffler install
Post by Kris01 on 07/09/16 at 18:55:47

3C35233F6065540 wrote:

So! To change the needle spacer I have to remove the gas tank, right? :-/

The tank is the easy part. Just wait until you have to put the carb back on! ;)

There ain't a whole lot of room!

Title: Re: Re-jetting after Harley Muffler install
Post by verslagen1 on 07/09/16 at 20:30:43

Once you get the tank off, no need to pull the carb unless you have trouble with the screws.

Title: Re: Re-jetting after Harley Muffler install
Post by Kris01 on 07/09/16 at 20:36:38

Oh... now ya tell me! ;D

Title: Re: Re-jetting after Harley Muffler install
Post by verslagen1 on 07/09/16 at 20:41:54

After I did it a half dozen times, I just said to hell with it and did it in place.

If you got a ratchet strap, hook one end on the right upper shock stud, take the strap around the front of the bat box, and hook it to the axle adjuster. tighten till the bat box clears the bottom of the carb.

then it'll be easy to drop the bowl.

Title: Re: Re-jetting after Harley Muffler install
Post by justin_o_guy2 on 07/09/16 at 20:55:40

Now, What kinda Engineer did you say yew wuz, again?

Title: Re: Re-jetting after Harley Muffler install
Post by verslagen1 on 07/09/16 at 20:58:22

domestic.

Title: Re: Re-jetting after Harley Muffler install
Post by justin_o_guy2 on 07/09/16 at 21:13:58

I was laughing, wife asked

What's funny?

Title: Re: Re-jetting after Harley Muffler install
Post by verslagen1 on 07/09/16 at 21:31:10

wassofunny? I was born here, trained here, and worked here all my life.

isn't that domestic? ;D

Title: Re: Re-jetting after Harley Muffler install
Post by hawk41 on 07/10/16 at 07:47:48

Trying to install my new Dyna and there is quite a gap between the header pipe and the muffler inlet. This gaps looks to be more than what a tightened clamp can handle. Suggestions please! Thanks! :-/

Title: Re: Re-jetting after Harley Muffler install
Post by justin_o_guy2 on 07/10/16 at 08:04:03

Is there a landing in the Dyna that stops the header going in"
How far is the header in the Dyna?
I had to grind the header to get the Supertrapp on.
I let sparks get near the battery vent.
I bought a new battery, because hydrogen is Very flammable.

Boy, if it ain't one thing it's another... I wanna get some Ride reports, instead of
Ohh, maan, it's busted..

Title: Re: Re-jetting after Harley Muffler install
Post by hawk41 on 07/10/16 at 08:43:13

There is approx. 2.5 inches from the ridge on the header pipe to the end of the pipe. The muffler slides on approx. 2 inches. The gap appears to be about 1/16 inches all the way around. I have a pretty "hurky" muffler clamp but I could not get it to squeeze down enough to seal the joint. :'(

Title: Re: Re-jetting after Harley Muffler install
Post by justin_o_guy2 on 07/10/16 at 09:17:17

How far do the slots go down the Dyna.
Are there enough slots to Allow the clamp to crush it down to the header?
Is your clamp a T Clamp?

http://idealtridon.com/aftermarket/t-bolts/

The usual headache is where you are, I think. Others have been making shims and using high temp pooky to get it sealed.
I wonder if lead would work..
You're not wrestling with it on the bike I hope..From what you have said, you're not..

If your clamp squeezes the end of the Dyna down but the edges of slotted area come together before it's crushed down, snot gonna seal.

I would have it off and put the clamp on it and see what happens without a header pipe in it.
The slots are probably long enough to make a good connection, but you might need to widen the slots a bit.

Title: Re: Re-jetting after Harley Muffler install
Post by hawk41 on 07/10/16 at 09:42:58

The slots are 1" long and 1/8 inch wide and if squoze (is that a real word?) down would certainly be a tight enough fit. I think my problem is my t-clamp which is about 1" wide. It is probably trying to squeeze too much pipe. A more narrow t-clamp might work. Where is the best store to try and find one, e.g. auto parts, home depot?

Title: Re: Re-jetting after Harley Muffler install
Post by justin_o_guy2 on 07/10/16 at 11:19:11

Without any squozing, how much bigger than the header is the unsquoze hole?
I have been seen using a body hammer just by the end of the slots creating a step to get the Fingers moved in a bit.
I don't see a problem with your wide clamp, unless it's wider than the slots. Well, you need some distance from the end of the slot. The more you need to collapse the mufflers Fingers in the more you have to have room between the end of the slots and edge of the clamp.

Title: Re: Re-jetting after Harley Muffler install
Post by hawk41 on 07/10/16 at 11:25:27

I found a 3/4" t-clamp in my stash and it worked better but if I can find a 1/2" t-clamp I think it will be all I need. Off to the store shortly to see what I can find. :)

Title: Re: Re-jetting after Harley Muffler install
Post by KennyG on 07/10/16 at 12:53:50

Hawk,

In my humble opinion, which is subject to review, get a genuine Harley Davidson Exhaust Clamp that you can torque it down as tight as you need it to be.

Kenny G

Title: Re: Re-jetting after Harley Muffler install
Post by hawk41 on 07/10/16 at 13:05:00

What a concept! A Harley clamp for a Harley muffler. If my latest clamp fails to squoze it down I will try the Harley route before I resort to a BMFH! LOL

Title: Re: Re-jetting after Harley Muffler install
Post by hawk41 on 07/11/16 at 11:54:32

Finally installed the 94' Dyna w/rail mount. Didn't bolt up like I thought it would. Using the standard mounting holes on the bike the muffler was a full 2" away from the end of the header pipe. I re-drilled the bikes mounting bracket and found that a standard 1 3/4 Heavy Duty Exhaust Clamp from Auto Zone worked just fine in clamping it to the header. Bike sounds good and runs pretty well without tuning the carb as it's over 100 degrees outside & I'm melting! Will see what I can do with the tuning in the morning when it's cooler! FYI - will be selling my extra 94-Dyna in the Marketplace shortly for $60, shipping included (USA only)!