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Message: [QUOTE="Jasle, post: 1257566, member: 26675"] put the new crank in. assemble without a base gasket and measure your SQUISH. The distance from the piston to head... This will tell you, and us, if your setup is close to correct. I don't know your specific reccomended squish but i'm thinking its .050" or more. So if it were .050 you'd expect the gap without gasket to be about .035 because the gasket is about .020 and it will compress... I'd suspect someone just slapped the topend together without measuring and had conflict. i've seen that many times. What compounds your issue is the bad rod brg. someone esle can chime in with your actual spec as i only work on smaller bore bikes typically. [/QUOTE]