Honda Outboards BF40A/BF50A Service Manual, Page 125Get this manual
HONDA BF35A45A
PISTON RING WIDTH
-TOP SECOND
STANDARD 0.990-1.025 mm (0.0390-0.0404 in) 1.190-1.225 mm (0.0469-0.0482 in)
SERVICE LIMIT 0.96 mm (0.038 in) 1.160 mm 10.0457 in)
PISTON RING SIDE CLEARANCE