Yamaha 25BMH 30HMH Factory Service Manual, Page 184Get this manual
POWR CRANKSHAFT AND CYLINDER BODY 5-30 REMOVING THE CRANKSHAFT AND CYLINDER BODY 5-30 CHECKING THE CYLINDER BODY 5-31 CHECKING THE PISTON 5-32 CALCULATING THE PISTON-TO-CYLINDER CLEARANCE .5-33 CHECKING THE PISTON PINS AND SMALL-END BEARINGS 5-34 CHECKING THE PISTON RINGS 5-35 CHECKING THE CRANKSHAFT 5-36 INSTALLING THE PISTON AND PISTON RINGS .5-39 INSTALLING THE CRANKSHAFT AND PISTON 5-39 CHECKING THE ANODE 5-40