2007-2009 Yamaha F15/F20 Outboard Service Manual, Page 31Get this manual
SPEC Item Cylinder Bore size
Specification Unit mm (in) F15MHF Model F15EHF F20MHF F20EHF
63.00063.015 (2.48032.4809)
Piston Piston diameter (D) Measuring point (H) Piston clearance(1) Piston pin boss bore Oversize piston diameter 1st 2nd Piston ring groove Top ring 2nd ring Oil ring Piston pin Outside diameter Piston ring Top ring Dimension Dimension End gap(1) Side clearance 2nd piston ring Dimension Dimension End gap(1) Side clearance Oil ring Dimension Dimension End gap(1) Side clearance Connecting rod Small end inside diameter Big end inside diameter Big end side clearance(1) Crankpin oil clearance