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[QUOTE="_JOE_, post: 1312014, member: 77507"]
Were the cylinder and/or head modified in any way from thier stock form? I don't really see detonation either, that usually leaves a funky lighter color on top of the piston. Usually low octane fuel or too hot a spark plug are to blame. I've heard of lean jetting contributing also. What happens is that the combustion chamber temps get too high and can even melt the piston. Low octane fuel burns quicker so it ends up igniting too soon, stressing the piston. This increases cylinder pressure and temperature. If the plug is too hot in the haet range it will cause the combustioin chamber temps to rise too. In some cases where guys run a cheaper plug like the br*es that's too hot the ground strap can break off and you know what happens then. Lean jetting will cause the mix to be more volitile as well and burn hotter.

If all else was stock, including the plug, I would lean towards the pipe having leaned the jetting or that concoction of low temp car fuel and your buddy didn't jet the bike after installing the pipe?
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