Honda BF20A-BF25A, BF25D-BF30D Outboard Motors Shop Manual., Page 106Get this manual
HONDA SFeOAaeSA
2OIL PUMP
1) Remove the cylinder head assembly
After assembling the oil pump and before installing it on the cylinder head, pour approximately cc (0.3 cu in) of oil into the oil pump body
1 OIL PUMP SHAFT ASSEMBLY:
Align the projection on the oil pump shaft with the recess in the camshaftIf difficulty
[61 OIL PUMP O-RING
1161 45 (4) 13 Nom-3kg-m, 9.4 ft-lb)