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450x stays rev'd up with throtle closed

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I installed a new pipe(CHM w/dB tube), had it rejetted with a 168, moved needle to third location. The bike runs great, but after running hard for a few minutes, it will stay rev'd up when the throttle is closed. Starts fairly easy cold and hot.

Any ideas? running too rich?

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you need to have freeplay in the throttle cables...after that check throttle cable routing, air leaks at the carb boots, and carb clamps are tight....

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