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2002 head help

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Hi all, I'm helping my sons friend with his bike, 02 YZ250f he just bought, we were checking valve clearance and could not lift the buckets off to replace the shims, what we found is the cam journals are mushroomed over the buckets, there is some scaring but no gouges.

I guess the last time the PO did maintenance he just tightened the crap out of the cam caps......

two questions. first we are going to try and debur the cam journals and proceed, until we can locate a better head....which leads to question 2, what year heads are compatible?

thanks for any help and those with some experience any other options?


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