2000-2005 Yamaha F40B Outboard Service Manual, Page 254Get this manual

IPOWRI '-'II
CRANKSHAFT AND PISTON
3Calculate: Piston-to-cylinder clearance Out of specification Replace the piston and piston rings, the cylinder block or bothPiston-tocylinder clearance
Cylinder bore

Piston diameter

Piston-to-cylinder clearance 0.0350.065 mm (0.00140.0026 in)

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