Crf 450 cutting out mid-high rpm range

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

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

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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