Honda Outboards BF40A/BF50A Service Manual, Page 49Get this manual
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GEAR OIL
11 GEAR OIL LEVEL CHECK
Check the oil level when the engine is in the venical
{11 OIL CHECK BOLT
positionRemove the oil check bolt and see if oil flows out If no oil comes out, fill through the drain plug bolt hole until the oil
starts to flow out through the oil check bolt hole 2} GEAR OIL REPLACEMENT
Remove the oil check bolt and drain plug boll to drain the oifInject oil through the drain plug bolt hole until it starts flowing out through the oil check bolt holeReinstall and tighten
the oil check bolt and drain plug bolt securely
DRAIN PLUG BOLT
I Gear oil capacity
Recommended
0.52 {0.550 US qt, .458 Imp