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Crf 450 cutting out mid-high rpm range

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If anyone can help it would be be greatly appreciated i have 04 crf 450 it acts like it hit the rev limiter at half throttle and i am not sure what to do it has new top and bottom end valves are set correct and carb is clean.. Maybe spun cam? It has been locked up. I dropped a valve in it did not replace cam

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I would have the cam spec'd out to be sure it is still in spec. Also, check your carb needle and the needle jet. There may be some very wrong there

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whats your clutch look like?  basket notched?  

most likely a clogged main jet ...if it was your cam I'd think you'd have much bigger problems before half throttle 

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