Honda Outboards BF40A/BF50A Service Manual, Page 127Get this manual
HONDABF35A45A 3) Remove the connecting rod and measure the plastigauge
STANDARD
SERVICE LIMIT
0.020-0.038 mm (0.0008-0.0015 in)
0.08 mm (0.003 in)
CONNECTING ROD BIG END AXIAL CLEARANCE
Measure the clearances with feeler gauge