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'04 WR250F Rebuild

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Hey TT,

 

13 year old bike and it's never had piston & rings done. It's time. Doesn't quite have the oomph it once did. So, I pulled the top end off, removed the jug and the piston. Ring end gap appears to be in spec, oddly enough. I'd have expected a larger gap. Cylinder bore still measures out at 77mm. Piston measures out at 76.8mm. Manual calls for 76.955 to 76.970 IIRC. Obviously, this is out of tolerance. The question is: how much of a difference would that really make in performance? Don't worry, I plan to replace the piston and rings either way. Just curious as to whether so little wear could make such a big difference.

 

-Matt

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Damn, guess nobody wanted to touch that one. In any case, I got the new piston and rings in. End gaps are much tighter (within spec) now. Figured out that all 5 valve clearances are out of spec, so that's next before I kick her over.

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Its a good bike. Make sure whoever cuts the valve seats has experience. I went cheap and my oem valves lasted 30 hrs.

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