Honda BF20 BF2A Outboard Motors Manual, Page 17Get this manual
HONDA BF20aBF2A
2GEAR OIL
1) Remove the gear oil level bolt and gear oil drain bolt to drain the oil2) Using the gear oil bottle (optional part), inject oil through the drain bolt hole until it starts flowing out through the level bolt hole3) Reinstall and tighten the level and drain bolts securely4)
Remove the oil bottle and reinstall the drain boltGear oil capacity 0.056 (0.053 US qt 1
Recommended oil CAUTION:
API standard (GL-4 or GL-5)
SAE90 outboard motor gear oil
If water detected in the oil, check the gasket and water seal for damage and the gear case for improper installation
OIL BOTTLE
3SPARK PLUG
Remove the engine cover and spark plug capRemove the spark plug using the socket wrench2) Visually inspect the spark plugDiscard it if the insulator cracked or chipped
BF20: BMR-4A (NGK) Standard spark plug