yz250wr powervalve removal?

i need to replace the power valve in the ol' 250. do i need to take the cylinder off or can itt be done on the bike. big job?any help or suggestions? thanks

You cant get to the power valves with the cylinder on the bike, so take it off. I just took out my power valves but off a yz125. I think you could do the same. Its prety simple.

I THINK on an 89 250 you can. This was a pretty basic design that should split in half. You have to remove the plate from the right side and the cover on the left.

You'll have a bolt running through the pv holding the piece together.

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