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[QUOTE="dirt bike dave, post: 1395249, member: 18302"]
Sounds like maybe the power valve is sticking open.

There is an inspection plug on the left side of the cylinder, which covers the end of the power valve shaft.  When the power valve opens, the shaft rotates 90*.  I think the power valve closed the notch in the shaft lines up with 'L' on the cylinder, and when it rotate opens the slot lines up with an 'H'.

Run the motor  with the bike in neutral and the inspection plug open, and see if the power valve is opening and closing properly.

If the powervalve is stuck open, the bike could run horrible under load and seem to be jetted wrong at low rpm, but run fine at high rpm.   Under no load and no throttle, it would probably rev high.

FWIW, on your CR250 when you put the cylinder back on you have to be very careful that the pin in the cases that operates the power valve lines up exactly right with a fork at the bottom right hand corner of the cylinder.  If you mess up this step, the power valve will not operate properly.
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Which ocean is California closest to?