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CRF450R need help

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My bike has a terrible miss if you rev in neutral the higher the rev the greater the miss. Riding it at cruising speed higher the RPM greater the miss. When hot it is hard to start, you have to use the hot start, I put DRD exhaust on it full system, recommended stock jetting and it is still there. Put in new crush washer for my head pipe no help! If I screw my air fuel mixer screw all the way in seems to help mildly. The only other thing I have done has but black plastic on it maybe it just don't like the plastic....someone PLEASE help me!!! I have sent it to local fix it shop 200 bucks and still there! Love ya all in a non-sexual sorta way..

New to this just need some help!

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