Yamaha Marine Outboards F4A/F4 Factory Service Manual, Page 186Get this manual
CRANKCASE, CRANKSHAFT AND CAMSHAFT
Oversize piston diameter: Over size59.25 mm (2.333 in) Over size59.50 mm (2.343 in) Except for USA Piston-to-cylinder clearance 1Calculate: 9Piston-to-cylinder clearance Out of specification Replace the piston and piston rings, the cylinder or bothPiston-tocylinder clearance
Cylinder bore