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2002 Honda cr 250 powervalve issue

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I am currently rebuilding my top end and had the barrel bored and rehoned.

The powervale is now sitting around 0.2- 0.4 mm proud inside the barrel and will score the new piston.

can the powervalve be adjusted or does it need filed down?

if so whats the best way to do this ?

Cheers.

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