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Message started by killeraxemannic on 08/10/14 at 13:17:25

Title: Having issues tuning my 2005 S40 for my climate
Post by killeraxemannic on 08/10/14 at 13:17:25

Hi all!

I live in Colorado at 5,000ft in a very dry climate. I just bought a 2005 S40 with 3k miles on it. It's a great bike and in great shape, but I can tell it's not tuned properly because it has the backfiring issue as well as has some power loss at some rpm's and chugs a bit when changing gears. The previous owner drilled out the exhaust so there are 4 1/2 inch holes in the muffler, as well as put in a K&N drop in filter. The idle mix screw plug is also uncovered. When I got it the idle mix screw was turned in pretty far so I have been gradually loosening it and testing. I have the screw pretty far out now and the bike runs better but still backfires and I can tell it just isn't quite right yet. I have read conflicting information about adjustments for this altitude. I have read that a higher altitude needs a leaner tune, but a dryer climate needs a rich tune. I have both here so I am not sure where to go.

I would also like to know if there are any easy performance mods I should do for my situation. I have read about taking off the airbox door, and removing the snorkel thing under the seat but I don't want to go about hacking up the bike if that's not necessary/needed.

Title: Re: Having issues tuning my 2005 S40 for my climat
Post by pgambr on 08/10/14 at 13:46:10

Welcome Killer, for starters take a look at this thread.

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

Feel free to post questions, best regards.

Title: Re: Having issues tuning my 2005 S40 for my climat
Post by verslagen1 on 08/10/14 at 14:19:03

backfiring can be too lean, but it also can be too rich.
what happens is that leftover gas accumulates in the muff and just waits for a breath of fresh air to ignite.

So the 1st thing to do is eliminate the fresh air. check for loose header bolts and air leaks all along the header and muff using a lit candle, the flame will blow around when you're close to a leak.

For a stock bike at your altitude, it's generally best to leave it stock.

You gotta K&N drop in and a drilled muff, both tend to push it leaner.

I wouldn't take out the snorkel or the door as that push it even leaner.

Tell us when it backfires as that's a clue as what to do.

Title: Re: Having issues tuning my 2005 S40 for my climat
Post by killeraxemannic on 08/11/14 at 09:06:26

53405756494442404B14250 wrote:

Did the candle check and didn't see any fluctuations in the flame around the header pipe or muffler.

When I got the bike it would backfire when I would let off the throttle to shift and when decelerating with the throttle closed. Now that I have the screw turned out quite a bit it only backfires when decelerating with the throttle closed. I was getting multiple pops during the decel but now I am just getting one big one twards the end of the decel.

Title: Re: Having issues tuning my 2005 S40 for my climat
Post by EJID on 08/11/14 at 09:14:18

How low is your idle set? With the closed throttle / decel pops, I find that when my idle is set a little higher it mediates most of my afterfires. I also notice that when my fuel tank is down to about 1/4 I tend to have more than normal (not sure why for me - with Raptor and vacuum tubes are plugged, cone filter & fish tail exhaust, but at a similar altitude 4500+ & dry)

Title: Re: Having issues tuning my 2005 S40 for my climat
Post by killeraxemannic on 08/11/14 at 09:28:55

040B0805410 wrote:

Not sure how to test the idle but I have it set so it idles smoothly with no shaking or anything. I could definitely turn it a bit higher and see how it goes. How did you fit a cone filter on it? Did you just remove the airbox? I am not sure if I want to do it but I would like to know the right way to do that setup if I want to give it a try down the road.

Title: Re: Having issues tuning my 2005 S40 for my climat
Post by Dave on 08/11/14 at 10:23:54

If you can't get your bike tuned with the stock air filter....I wouldn't suggest going to a cone. It will be harder to tune that to run well.

Dave

Title: Re: Having issues tuning my 2005 S40 for my climat
Post by killeraxemannic on 08/11/14 at 10:27:00

7A414C5B4A465D5B4048455A290 wrote:

If you can't get your bike tuned with the stock air filter....I wouldn't suggest going to a cone. It will be harder to tune that to run well.

Dave

Well from what I am reading it appears that I am probably going to have to change the jets in the carb, so if the cone filter is higher performance then I may want to go that route along with a re jet.

Title: Re: Having issues tuning my 2005 S40 for my climat
Post by Dave on 08/11/14 at 10:45:19

The cone filter does little (or nothing) on the Savage performance by itself. The engine is horribly restrictive inside, and the CV carb isn't great for performance, and the engine is low compression with a very mild cam. The muffler change to a DYNA and decent jetting is the best bang for your bucks.

The cone filter is mostly done by folks wanting the look...they want to get rid of the airbox and battery and make a big open space under the seat. The stock air filter works well enough for the stock engine and carb.

Dave

Title: Re: Having issues tuning my 2005 S40 for my climat
Post by EJID on 08/11/14 at 10:49:30

I don't know that the cone is actually any better performance, I just wanted a change over what the previous owner had done to the bike...

Previous owner air cleaner setup:
http://p1.bikepics.com/2009/09/03/bikepics-1771553-full.jpg

My setup...can't see the cone that well, but mounted right on the carb throat:
http://p1.bikepics.com/2013/04/09/bikepics-2540122-800.jpg

Title: Re: Having issues tuning my 2005 S40 for my climat
Post by killeraxemannic on 08/11/14 at 10:49:41

7C474A5D4C405B5D464E435C2F0 wrote:

Good to know! How much better would the Dyna muffler do for me? My stock muffler is already drilled out.

Title: Re: Having issues tuning my 2005 S40 for my climat
Post by Dave on 08/11/14 at 11:00:15

1 or 2 hp.....not a bunch. Having the correct jetting make the biggest chance if the bike is not jetted well for your location. When I got mine it has a big flat spot just off idle....and it was really irritating as it would show up whenever tried to ride without a handful of throttle.

The biggest advantage in the DYNA is that you lose the VW Beetle sound......and get a bit better tone without a lot of racket.

Dave

Title: Re: Having issues tuning my 2005 S40 for my climat
Post by killeraxemannic on 08/11/14 at 13:47:28

5D666B7C6D617A7C676F627D0E0 wrote:

Mine sounds pretty decent drilled out. I think I am going to order a few jet sizes today so I can experiment with them. Looks pretty easy to swap the jets out. Just drain the fuel from the carb, unscrew the screws and put the jets in right?

Title: Re: Having issues tuning my 2005 S40 for my climat
Post by justin_o_guy2 on 08/11/14 at 16:03:18

AND the Dyna Looks so much better and it is lighter.

Title: Re: Having issues tuning my 2005 S40 for my climat
Post by killeraxemannic on 08/11/14 at 20:16:16

I wasn't really thinking earlier. A girl I work with's husband is a salesman at a Harley dealer. I am sure he can find me a Dyna pipe.

So it looks like to start off I need to install the Dyna muffler, do a 150 main jet and a 55 secondary, as well as do the 2 washers instead of the plastic spacer. Would that be a good starting point?

Title: Re: Having issues tuning my 2005 S40 for my climat
Post by Dave on 08/12/14 at 03:37:10

You don't want a #55 Pilot Jet at 5,000 feet elevation.....that is way too rich. I would start with a #50 Pilot and a #150 Main......and even that may be a bit rich for that altitude.

Dave

Title: Re: Having issues tuning my 2005 S40 for my climat
Post by killeraxemannic on 08/12/14 at 07:38:15

764D4057464A51574C444956250 wrote:

You don't want a #55 Pilot Jet at 5,000 feet elevation.....that is way too rich. I would start with a #50 Pilot and a #150 Main......and even that may be a bit rich for that altitude.

Dave

Ok I will give that a shot when I get the jets in. I ordered them from Lancer yesterday. Thanks!

Title: Re: Having issues tuning my 2005 S40 for my climat
Post by killeraxemannic on 08/16/14 at 21:09:32

Well I got my jets in the mail today and I found some very strange things. The pilot jet that was in my carb was 57.5 and the main was 145... From what I am reading stock is 52.5 for pilot so it looks like someone swapped in a really huge pilot jet and left the main alone? I have no idea why someone would do this especially at 5,000ft. The 50 pilot jet I put in seems like it's just right for me.