450x stays rev'd up with throtle closed

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?

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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