Honda BF15D BF20D Outboard Motors Shop Manual., Page 194Get this manual
PISTON PINS 1) Measure and record the piston pin O.Dat three position shownStandard 15.99416.000 mm (0.62970.6299 in) Service limit 15.97 mm (0.629 in)
2) Calculate the piston pin-to-pistonclearanceStandard
Service limit 0.04 mm (0.002 in)
0.0020.014 mm (0.00010.0006 in)
CONNECTING ROD SMALL END I.DMeasure and record the connecting rod small end I.DStandard 16.00716.022 mm (0.63020.6308 in) Service limit 16.05 mm (0.632 in)
PISTON RINGS
1) Inspect the piston rings, replace them if they are wornReplace the piston ring as set2) Measure the piston ring thickness,Topsecond