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Message: [QUOTE="griffbones, post: 1187948, member: 72285"] I did two warm up cycles and then a real easy five minute ride, then after another cool down I rode it for about ten minutes max at only partial throttle. And what caused the first failure? This thing had a tan plug when it was 50 degrees outside, but it failed on a 75 degree day, should have been even richer, no? That imprint is where the piston appears to have drug on the intake port and rolled the metal up. Could a CDI box go bad and throw the timing wacko and cause it to heat? The first failure bothers me more than the second because the plug had been running so good and I just don't see the reason for that failure. I maybe should of had the cylinder re-plated before going another round, but I didn't think it looked that bad. After the second failure there was plenty of oil film in the cylinder but it was full of gray paste! [/QUOTE]