Honda BF50 (5HP), BF5A Outboard Motors Shop Manual 2014, Page 130Get this manual
2PISTONBREATHER CHAMBER a, DISASSEMBLYREASSEMBLY
MARKING
PISTON RING
Install with the markings facing upward Be sure that the top and second rings are not interchanged Check that rings rotate smoothly after installation Space the piston ring end gaps 120 degrees apartand do not align the gaps with the piston pin bore Space the side rail end gaps at least 10 mm (0.4 in) apartCoat the oil ring with oil after assembly} SECOND RING
TOP RING (CHROME PLATED) SECOND RING OIL RING (COMBINATION RING) OILRING
SIDE RAIL (2)