Reply To: Piston rings

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November 2, 2025 at 8:51 am #301144
TOM GOEPFRICH
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    I’ve never used ring  compressors on a out board either until I was trying to assemble an early Koban twin. Pistons are installed from bottom of bore inside the crankcase and the rings are 5/8″ wide!! I had to machine a special ring compressor to get the rings into the bore.