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Message: [QUOTE="Tom L, post: 861083, member: 57721"] Maybe, for some odd reason, the piston - cylinder clearance is insufficient. Maybe a factory flaw. Oversize piston or undersize cylinder may not allow enough clearance for thermal expansion once it gets hot. I'm sure someone on this site could tell you what the clearance should be if you don't already know. Have you measured the piston O.D. and cylinder I.D.? I think there should be a couple thousandths clearance anyway or somewhere in the .002" - .005" range? Someone help me out here. What's the spec. on that??? Anybody??? [/QUOTE]