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Phillips head screws in powervalve won't come out. 2000 YZ250

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I have a new cylinder and piston for my 2000 YZ250 and need to take the powervalve out of the old cylinder.  However I can't get the Phillips heads screws to budge.  I haven't stripped them yet but it's inevitable if something else doesn't work.  Do any of you have any suggestions?  Do any of those anti seize liquids work, impact drill, I am certainly open do suggestions.  I do not want to have to pay for a new powervalve when I have a perfectly good one that's just being held in by 5 stubborn screws.

 

Thanks

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Mine were the same, impact driver is the route. Basically a big steel screwdriver that you hit with a hammer and it turns it self might even need to use heat. They must use red loctite when installing

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If you have a cordless impact drill, it will work better than the manual kind. You can also get JIS bits.

Edited by 351mustanger

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