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yz250wr powervalve removal?

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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

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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.

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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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