Honda BF20A-BF25A, BF25D-BF30D Outboard Motors Shop Manual., Page 124Get this manual
HONDA BFSOAmSSA
PISTON RING WIDTH
STANDARD
SERVICE LIMIT
1'175-1190mm (0.0463- 0.0469 in)
1.08mm(O.O43in)
PISTON RING SIDE CLEARANCE
TOP SECOND
STANDARD
SERVICE LIMIT
0I mm (0.004 in,