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2002 crf450 cutting out, shop didnt figure it out!

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I have a 2002 crf450r, recently, it has started cutting out/sputtering at STEADY half to three quarter throttle position only, at full throttle, it rips great! I neeed this fixed, as I do  alot of hill climbs and cruising @ half throttle. thanks in advance, I know there are forums, which ive searched, but none are 2002 and I will post a link to a youtube video if possible.

 

actions taken = had shop check/install new jets. valves are good, timing is good stationary, haven't checked it with a timing light. replaced spark plug. checked fuel flow- good. removed kill switch and test rode- ok.hot start cleaned. fresh fuel. swapped throttle position sensor with my '04- problem remained.

 I will be checking the stator for output according to the manual tomorrow. not sure what else to check. thanks.

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