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2007 Yz250f rebuild

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So I messed up a bolt on my head and had to order a new one, I thought it would be a good time to do valves. Two ended up being tight, but I understand cam chains need to be changed regularly so my buddy tore into the engine for me and found all kinds of odd things. A cam chain guide was almost broken I half, it had a wiseco standard diameter domed piston and has a hotrods crank in it. Can I replace the piston with a stock unit? I understand they are a little tighter. Btw, I purchased this bike 3months or so ago and it ran great until I messed up the bolt.

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