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popping

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i have a yz250f built. it has new valves, dual spring kit, web cams, 270 piston

head work, eccelerator pump opened up, new stator and fly wheel. bike runs good on the street but on the track when it hits the bumps it pops and falls away.

onearmdave

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220 main?!?!? :applause: I didn't know they made one that big. If that's your main jet size then that sounds very rich, even for a big bore kit.

If that's the recommended jetting, and it pulls strong at high RPMs on the street, then maybe the bumps on the track upset the fuel delivery. Make sure your float is set right.

But check out that main jet. The biggest I've heard anyone using is 190, and thats with special fuel, heat tape on the pipe, big bore, etc.

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