Yamaha 25BMH 30HMH Factory Service Manual, Page 246Get this manual

Yamaha 25BMH 30HMH Factory Service Manual, Page 246

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CRANKSHAFT AND CYLINDER BODY
1 Check: Cylinder inner surface Score mark Repairreplace(use #600 800 grit wet sandpaper) Water jacket Mineral depositsrustcorrosion CleanreplaceCAUTION: Do not scra