Piston/vaulve smaking the plug??
2nd time I have removed a plug and what appears that the piston is taping or hitting the top of spark plug. This hasn't happened until I rev. the engine over the 10k rpm range. I just have a 155cc BB in it. But wondering if maybe gasket to thin? Or is it getting hit by the vaulve when gets in higher rpm range? Kind of hard to see, but got taped where the plug Elec. goes into it's turn. Anyone come across same issue?
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