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[QUOTE="griffbones, post: 1188263, member: 72285"]
Why did the original run almost 8 hours before failure?  It was fresh premix at 40:1 so how did the lubrication go away?  The bike had stock jetting so it should not have been lean, and previous to the first failure it was running a nice tan plug.

I did check the ring gap and it was well with in Wiseco's specs of .012 - .020, I think the specs are?  I don't remeber the exact range and my instruction sheet from Wiseco is at home on the work bench.

What ever caused the first failure I believe caused the second failure, so what I need to find out is what changed and why so quickly?  Or was my son really running it too hard on a long straight away?  After words it started right up and ran fine just sounded noisey. So maybe the exstinsive dammage was because we continued to run it after the failure.  Maybe the second went becuase the cylinder was in worse shape than I thought, or maybe my sanding of the scratches with 440 grit paper and WD40 was the wrong thing to do???
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