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2006 CRF450x revving high on its own

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I have a 2006 CRF450x that runs great 95% percent of the time. After riding for 10-20 minutes sometimes the engine wants to rev high on it's own. So I'm heading down a trail and all of a sudden the bike starts to rev high and get loud with no difference in throttle position. Bike will run and drive ok but I'm in "overdrive" with a bike that's RPMs are really high. After a few minutes it settles down again and runs great. Any ideas welcome on how to fix. Thanks guys. 

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Check if the carburetor is falling off (i.e. slipped out of the intake boot) or just loose?

 

RZ Rob

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