Honda Outboards BF40A/BF50A Service Manual, Page 124Get this manual
HONDABF35A45A
INSPECTION
For pistons, crankshaftand cylinder inspection, measure the followingIf needed, replace them
PISTON SKIRT 0.0Measure and record the piston 0.0at point 10 mm (0.4 in) from the bottom, and SOD to the piston pin bore10 mm 10.4 in)
SERVICE LIMIT
_ 2_.7_5_5_5 6_9_.S_1_0_m m_(_2_.7_5_2_4
PISTON PIN HOLE 1.0STANDARD