2007-2009 Yamaha F15/F20 Outboard Service Manual, Page 39Get this manual
SPEC Item
Specification Unit mm (in) mm (in) mm (in) mm (in) mm (in) mm (in) mm (in) mm (in) mm (in) mm (in) Model F20PHF F20PRF
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 Crankshaft Crankshaft journal diameter Crankpin diameter Crankpin width Crankshaft run-out limit