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cr80 rebuild

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So i have a little project going, putting in a piston and cylinder in a 02 cr80 expert. I've always had 4 strokes, and done know much about the 2strokes, so i have a couple questions if you guys dont mind helping me out. My question is, since the cylinder is all scored up, can i just bore out the piston, or is there a special coating on it that wont allow overboring. Also is re-sleeving an option? Lastly how do i go about checking the reeds. they are fully entact, no chips or nicks, but they are slightly open, any way to check if they are good or not?

Thanks for any info

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Thay have to bore the cylinder to sleeve it, and the coating(plating) is nikisil. I would just get it replated rtaher than resleeve.

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