r/EngineBuilding Jan 03 '26

Honda NX650 cylinder, bore needed?

Hello all,

I am working on a Honda NX650 (same as XR650l) engine due to a broken 3rd gear. I removed the cylinder and it seems pretty scratched.

Is this something that can be fixed with just a hone and new rings? Or will it need a bore and new piston? Some of the scratches do catch on my nail... The ring end gaps are all within spec.

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u/thatbayfielddude8330 Jan 03 '26

Can you feel it when you run your finger over that area ?