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03 crf 450 backfires when it starts


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backfires when it starts (pops once)and when trying to start it. and to start it i have to hit the gas as i kick it. the bike runs fine once started no idleing problems or anything else what so ever just getting the bike started. tried adjusting the mixture screw and nothing. bike has powercore 4 exhuast and dynojet jet kit. the bike ran fine before i turned the screw (it was running a little rich). and that's all i changed so i threw out alot of diff alternatvies

what u guys think??

bigger pilot jet??

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  • 10 months later...

ive been having the same problems with mine to day since i leaned off the mixture because i thort it was running to rich i almost got it sorted now. factory setting is one and a half turns out, from there tiny movements on the screw seem to make a big differance, its jus got to be perfect for it to start first kick. i found super unleaded helps to.

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