Yamaha 25BMH 30HMH Factory Service Manual, Page 254Get this manual

Yamaha 25BMH 30HMH Factory Service Manual, Page 254

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CRANKSHAFT AND CYLINDER BODY
CHECKING THE PISTON RINGS
NOTE: Before checking the piston rings, be sure to check the cylinder body Piston rings should be replaced as set (per piston)1 Check

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