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  1. S

    57.mm end gaps?

    Can someone tell me the stock gaps for a 57mm piston in mm. I heard 4mm. Not for sure. 1st n 2nd compression rings measurements. In not good with math lol so a direct answers in mm would be ideal. It's for a 150gy6 engine
  2. S

    Oil expander ring?

    Do the ends on a oil expander ring point up or down? What's the difference if so......on a gy6 150cc
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