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CRF450R and X 07 problem


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I have a crf450 R with main 170 and pilot 45, runs great but doesn't want to

start with the choke on.

I also have a crf 450X with the same jetting and runs great only when the engine is cold I dont have any power to 1/4 of the throtle. When the engine is warm the problem disapears.👍

please help

Greetz Prodigy

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If you set your fuel screw correctly, warmed up engine and at idle. You should turn it in until you hear the engine start to stutter or change rpm and then turn it out until it does the same thing. Set it at the middle of those turns. If your fuel screw does nothing? Try setting your main jet needle down one clip. Hope this helps?

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