Yamaha 25BMH 30HMH Factory Service Manual, Page 252Get this manual

Yamaha 25BMH 30HMH Factory Service Manual, Page 252

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CRANKSHAFT AND CYLINDER BODY
2 Measure: Piston pin outside diameter (use an outside micrometer) Out of specification ReplaceOutside micrometer 90890-03006 Piston pin outside diameter 19.895 19.9