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Message started by kk lewi on 04/17/10 at 17:10:35

Title: exhaust wide open
Post by kk lewi on 04/17/10 at 17:10:35

ok first off it's an 07. I bought it and it had a slash cut Jenkins exhaust. The darn fool/stealership had the mixture screw 5 turns out! Needless to say she ran rich and backfired like crazy. I've been trying to dial in what is right for her (I couldn't get Lancers guide to work right). So I'm sitting at 1.5 out and she runs pretty well, backfires a little on decel but not bad, and when I turn it off I just get a poof, usually.

Does 1.5 out seem too little? For an open exhaust (which a Jenkins is?) that seems too little. I had it at 2.5 out and it was too rich. Black spark plug and rear brake lever.

Perhaps the previous owner not only put a Jenkins on it but did something with the carb? Is there a way to tell? I'm hesitant to break into the carb as she is my only mode of transportation atm...

Could the backfires on decel be from the two stage exhaust and I need to put some muffle goo in there or maybe there is a leak at the header? I've torked the header down (not too much) and the slip on muff is as tight as I can get it.

Title: Re: exhaust wide open
Post by bill67 on 04/17/10 at 17:15:58

Sound like its running normal to me,They do backfire a little a poof,on shut off.Mine does anyway.

Title: Re: exhaust wide open
Post by verslagen1 on 04/17/10 at 17:16:31

if you are getting a poof at shut off with an open exhaust, you are doing really well.
when is it back firing?
is it a back fire or grumble pop?
you tightened the header and muff, try the intake.

You might try the air cut off mod

Title: Re: exhaust wide open
Post by kk lewi on 04/17/10 at 17:25:15

is the Jenkins an open exhaust?

I get mostly grumble pop on on decel but sometimes it will backfire at random times. I don't really care really but the backfire on shutoff really embarrasses me when I know it shouldn't do that.

Air cut off mod? Search doesn't find it. I was actually just about to do Oldfellers air filter goodness.

Title: Re: exhaust wide open
Post by verslagen1 on 04/17/10 at 18:17:16

so I remembered the wrong bs....

http://suzukisavage.com/cgi-bin/YaBB.pl?num=1267767908/11#11

Title: Re: exhaust wide open
Post by Routy on 04/17/10 at 21:26:13

Quote:
I don't really care really but the backfire on shutoff really embarrasses me when I know it shouldn't do that.
-----------------------------------------------------------------
What do you mean, "they shouldn't do that "?
Every s-40 that I know of backfires on deceleraition, and poofs on shutdown. And Suzi says its normal, so I don't understand the part...."I know it shouldn't do that"

Title: Re: exhaust wide open
Post by RTC on 04/17/10 at 21:49:01

i'm pretty sure everyone one here has a backfire on decel and at LEAST a poof on shutoff. I know what you mean though when you pull up to a busy gas station and the overhead cover just amplifies the sound it is a little embarrassing but i have learned to deal with it. messing with the mix screw can cut it down quite a bit also it seemed that adjusting the idle speed hand screw to a firm high idle has helped out too. another trick i learned is to cut the bike off and coast into my parking spot. dont know why but this cut down the shut off pop. I pulled in to work the other day and parked in the motorcycle spot. there were a few other riders there and my bike popped pretty loud when i shut it down. one guy said "whoa, she's talking to you man!" and i said "yeh she always does, i think she likes me" ;D

Title: Re: exhaust wide open
Post by kk lewi on 04/18/10 at 11:54:10

232C362D313724262E2037450 wrote:

Many people on this very site say that they have 0 backfires. That is what I meant. I haven't seen where Suzi says it's normal but if that is the case they should smack their engineers. HARD :P Engines, when properly tuned, shouldn't backfire. IMHO.

Title: Re: exhaust wide open
Post by kk lewi on 04/18/10 at 11:57:47

3D283025263B490 wrote:

HAHA! EXACTLY RTC on the gas station! I didn't think of the high idle. Mine's not set that high so I'll try that and see what I get!

Title: Re: exhaust wide open
Post by verslagen1 on 04/18/10 at 12:13:55

20352D383B26540 wrote:

i'm pretty sure everyone one here has a backfire on decel and at LEAST a poof on shutoff.

I'm pretty sure you're wrong. On last years dragon run not one KABOOM was herd from a herd of savages. And unless you're counting a grumble pop as backfire, I'll have to rename it to grumble poof. ;D

Title: Re: exhaust wide open
Post by RTC on 04/18/10 at 21:17:53

well unless we got our grumple poofs together and had them chat a while then i'm not sure we'll know if we're talking about the same thing ;D. but....all i'm sayin is that at ONE time or another we have had some sort of backfire and unless it is an alarming sound then one shouldn't be alarmed :). but by all means try and fix it. that's the goal here right? to make our bikes run as smoothly as they can?

Title: Re: exhaust wide open
Post by Bubba on 04/19/10 at 08:45:31

I've noticed that I can get rid of the backfire on shutdown by turning down the idle just before I shut down. Anyone know why that would work? :-?

Title: Re: exhaust wide open
Post by Rocco on 04/19/10 at 08:53:05

i used to get a rifle shot on decel when i put the debaffled sporty muffler and k&n in before the rejet. she would pop pretty loud before any mods too, now she growls and poofs on shutdown ALTHOUGH when it's cold i get the bazooka on shutdown lol

when asked why mine makes so much noise my buddy goes "that's a 650 single slammin up and down in there! you know how much pressure that is?" LOL!!!

Title: Re: exhaust wide open
Post by EJID on 04/19/10 at 09:36:08

427F73737F100 wrote:

I don't know if I would call in COLD in S. Florida at any given time! ;D

Title: Re: exhaust wide open
Post by Serowbot on 04/19/10 at 09:38:36

Big singles tend to backfire..... Honda xl650's a quite famous for it too...
Blats and pops are okay... you just don't want the gunfire cracks...