That actually sounds pretty normal to me.
I think the power valves open briefly at 3000rpm.

I strongly suggest having a read about the powervalves in the tuning section:
http://www.nsr-world.com/tuning/250-tuning/engine

also, just search the forums and read up about power valve stuff in general:
http://www.nsr250.net/forums/viewtopic.php?p=90986#90986
http://www.nsr250.net/forums/viewtopic.php?t=4405
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