So my buddy bought a klx250s a couple years ago and it recently developed what we're pretty sure is a leaking head gasket. It has a 351 big bore kit the PO installed. Do big bores require a special head gasket? Although I've replaced head gaskets on cars and trucks before, I've never done a motorcycle or anything that was overbored.

 

It's help to find out which company the PO used. Bill Blue's big bores have a sticker on the cylinder, but that could be long gone. I'd guess the one of his 351 head gaskets would work since the bore's the same

 

BB sticker is on left side of cylinder. "B&B Restoration", or something like that, and the serial number is stamped into the metal on the right side of the cylinder.

 

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I'll check for that, thanks!