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piston is detonated. caused by preignition. not sure if it was from lack of cooling or lack of fuel until it comes apart. the hole in the bottom liner is a port. supposed to be there. I will put up a picture of what the piston should look like tomorrow when I work on it again. if I had kept running at high speed the piston would have a big hole right in the middle of it. motor is going to get a cylinder hone job and 4 new pistons rings etc. I will try to put up some pictures as is comes aparts and goes together.
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