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Sportster Motorcycle Transmission, Clutch, Primary & Secondary Drive Transmission, Clutch and primary or secondary drive problems, advice, and/or how tos.

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  #11  
Old 23rd August 2009
allen78 allen78 is offline
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have a 2005 and it does the same thing have done a bunch of different things to cure it put a screaming eagle jet kit in it, to cycle shack pipes, to K and N air filter, 1200 conversion still does it not as bad but,still does it. have heard it could be a intake gasket leak so i tested that theory and i didn't have a leak so the only thing i did to make it not do it as bad is put a 175 jet in the carb 1 3/4 drag pipes and a K and N filter on it. needless to say have a pretty fast bike but, still does the carb fart as many people say. hope that helps
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  #12  
Old 23rd August 2009
Mbagger Mbagger is offline
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Quote:
Originally Posted by FoxsterUK View Post
I'm gonna guess this is carb farts. Check the gazillion threads around here about them. Cause is leanness off idle. Fix is to richen this area. This might be as simple as tweaking out the idle mix screw 1/2 a turn.

Fox
What Fox said.

You are describing a carb fart, not a pop/backfire out the exhaust.

It is too lean at idle...either an intake leak or adjust your idle mixture...I am sure there must be a thread somewhere on this board explaining the steps on adjusting the idle mixture screw.

Get it fixed though...you don't want to be in a low speed turn and have it fart...good recipe for dropping the bike.
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  #13  
Old 23rd August 2009
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Quote:
Originally Posted by allen78 View Post
have a 2005 it does the same thing have a screaming eagle jet kit tried all different things change jets change pipes went from cycle shacks pipes to 1 3/4 drags Milwaukee twin pipes. screaming eagle air filter to a KN filter. 1200 kit on it, i have heard it might be a rip in the intake gasket, but replaced it. it dont do it as bad now as it did but it still does it. the only option i can say is get a 175 jet in the carb a KN air filter and 1 3/4 drag pipes
It sounds like you could have an air leak. You need to eliminate any air leaks before you adjust the mixture, change jets, or whatever. You say you changed the 'intake gasket', what do you mean by that? How's the carb seal ring and the intake seals? How about exhaust leaks?
Intake And Exhaust Leaks Tests
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  #14  
Old 23rd August 2009
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Mines popped more since i put the heavy breather on too
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  #15  
Old 23rd August 2009
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nature of the beast..... check leaks, and richen up air/screw mix like they said. should help.

cc
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  #16  
Old 23rd August 2009
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Quote:
Originally Posted by allen78 View Post
have a 2005 it does the same thing have a screaming eagle jet kit tried all different things change jets change pipes went from cycle shacks pipes to 1 3/4 drags Milwaukee twin pipes. screaming eagle air filter to a KN filter. 1200 kit on it, i have heard it might be a rip in the intake gasket, but replaced it. it dont do it as bad now as it did but it still does it. the only option i can say is get a 175 jet in the carb a KN air filter and 1 3/4 drag pipes
None of the last three options that you have described in your last sentence will do anything to minimize carb farts! A larger main jet would have no influence in the area where he has described the farts occur, a K&N filter would make it leaner than stock and drag pipes with no baffles could only make things worse. If you have done this and nothing else, that's why you own farts haven't been minimized. Following your advice won't help.


Quote:
Originally Posted by allen78 View Post
have heard it could be a intake gasket leak so i tested that theory and i didn't have a leak so the only thing i did to make it not do it as bad is put a 175 jet in the carb 1 3/4 drag pipes and a K and N filter on it. needless to say have a pretty fast bike but, still does the carb fart as many people say. hope that helps
Unfortunately, it won't help.
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  #17  
Old 23rd August 2009
allen78 allen78 is offline
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have taken bike to two different shops and have adjusted the lean and rich jet and it seems that helped more than anything like i said it still does it but, not as bad guess it is the nature of the beast....
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  #18  
Old 23rd August 2009
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It's not the nature of the beast; it's the nature of a bike that isn't correctly maintained / tuned.
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  #19  
Old 23rd August 2009
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Quote:
Originally Posted by allen78 View Post
have taken bike to two different shops and have adjusted the lean and rich jet and it seems that helped more than anything like i said it still does it but, not as bad guess it is the nature of the beast....
No jets on the Keihin CV carb are adjustable but they are replaceable. Your pilot jet and idle mixture screw have the most influence on carb farts, Leaning it out further with a hi flow air cleaner and unrestricted exhaust can only make it worse until the mixture is corrected. Increasing the size of the main jet won't help at all as the engine isn't running off that carb circuit when carb farting.
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  #20  
Old 25th September 2009
883hugger03 883hugger03 is offline
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mine does this to o3 883 carb mine pops and sputters out i feel alot of air coming from around breather cover it has aftermarket pipes not sure what they are on it when i got it, but it does get annoying! ive check all screws around carb and put a K&n filter in it that really helped out alot.
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