Yamaha Outboard Motors Factory Service Manual F6 and F8, Page 288Get this manual
CRANKSHAFT, PISTON AND CYLINDER BODY CHECKING THE CYLINDER BODY
Measure: Cylinder bore (with cylinder bore gauge) Out of specification Rebore the cylinder or replace the cylinder bodyStandard Measuring point "H" Wear limit
H1: 20 mm (0.8 in) H2: 40 mm (1.6 in) H2: 60 mm (2.4 in) Cylinder bore 56.00056.015mm "D" (2.20472.2053 in) Taper limit 0.08 mm "T" (0.0031 in) Out of round 0.05 mm limit "R" (0.0020 in) D= Maximum D1, D2, D3, D4, D5 or D6 T= (Maximum D1 or D2)(Minimum D5 or D6) R= Maximum (D1 or D2) or (D3 or D4) or (D5 or D6)