2001-2002 Yamaha 50HP F50Z/T50Z Ouboard 4-stroke engines service manual, Page 177Get this manual
Cylinder body 2Remove the crankcase bolts in the sequence shown
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Piston diameter62.95-62.96 mm (2.478-2.479 in) Measuring point (6): mm (0.2 in) up from the bottom of the piston skirt Oversize piston diameter: Oversize 1: +0.25 mm (0.01 in) Oversize 2: +0.50 mm (0.02 in)
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Checking the cylinder bore
3Remove the connecting rod bolts and the piston assembliesRemove the crankshaft, oil seals, and dowel pinsRemove the piston pin clip CD with pliers, and then remove the piston1Measure the cylinder bore (D 1-Dat measuring points (6), andand in directionwhich is parallel to the crankshaft, and direction CD, which is at right angle to the crankshaft5