When you polish aluminum transfer it ends up looking like shiny plating. It’s also probable that there’s a sharp edge of plating where the old piston scored and caught it at the bottom of the exhaust port
I can’t remember what all we did either. I know (think) we went both ways with hybrids. Did I put Dolmar cylinders on Solo’s and machine a Solo cylinder for you to put on a Dolmar? I do remember the issues with the piston but can’t remember details
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