[geordan708]

ive had my 2008 CRF450 little over a year now. just put a top end on it to freshen it up a bit. bike ran fine before but now it acts like it wants to cut out at high RPM. and no, its not the rev limiter. it wont rev high enough to hit the rev limiter. ive checked timing, valves, cleaned out the carb. jetting has never been touched. its always run good with no jetting issues until now. ive talked to some local guys and we cant figure it out. any ideas?

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Sorry we missed your post.
Well, one things for sure.
If it ran good before and it doesn't now the problem is in the re-assembly,and like you said, its not the jetting.
I'll bet you are one tooth off on the timing.
If you read the post and have rectified the problem, let's hear it. Doug