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Backfire at start up....

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Lang

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hello, i still cant figure this out. i sometimes get a backfire when i start my bike after its warmed up. i checked for exhaust leaks couldnt find any. no intake leaks. what else could it be. thanks

lang
 
Lang said:
hello, i still cant figure this out. i sometimes get a backfire when i start my bike after its warmed up. i checked for exhaust leaks couldnt find any. no intake leaks. what else could it be. thanks

lang
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Is it exhaust gas in the muffler? or is it a Kick back thru the intake?

Big difference...

Can you go into more detail?

What is done to the bike.. List ALL Modifications..

signed....BUBBIE
 
sounds like a big pop out of the exhaust not intake and not everytime. its a 883 with a 1250 big bore kit. screamin eagle II slip ons, twin tec adjustable ignition in the nose cone, arlen ness big sucker stage 2 a/c, andrew n4 cams, screamin eagle coil, stock heads. like i said after i drive for a bit and it gets warmed up real good and i shut it down and restart it will pop out of the exhaust. not everytime. thanks
 
yes it is the 1005 and yes i am running dual fire mode. i never thought of that. i do have a single fire coil but havent installed it. maybe i will try that. it does make sense. thanks


Lang
 
Could be hot spots on the tops of the pistons, try some seafoam in the gas:s
 
Hoople said:
Model 1005? If so are you running single or dual fire mode. Running dual fire mode increases your chances for issues like the one you are having.
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GOOD Call Hoop,,,, The single fire will Probably solve the problem...Plus not wasting a spark..
Extra gas vapors will cause the problem especially with Duel fire set-ups on start-up..

Been thar done that type of thing......

signed....BUBBIE
 
My bike used to do this for a long time, until I properly tuned it with correct jetting and setting the mixture, along with a Dyna 2ki in the nose cone.
 
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