Honda Bf8a Owners Manual

49 SERVICING YOUR OUTBOARD MOTOR
ENGINE OIL CHANGE
An engine oil evacuation device may be used to remove the engine oil.
Drain the used oil while the engine is warm. Warm oil drains quickly and
completely.
1. Move the engine cover lock lever (p. 48) down to unlock the cover, and
remove the cover.
2. Place a suitable container below the engine oil drain location to catch the
used oil, then remove the oil filler cap and the drain screw.
3. Allow the used oil to drain completely, then reinstall the drain...

50 50 SERVICING YOUR OUTBOARD MOTOR
ENGINE OIL RECOMMENDATIONS
Oil is a major factor affecting performance and service life. Use 4-stroke
automotive detergent oil.
SAE 10W-30 is recommended for general use.
The SAE oil viscosity and service classification are in the API label on the oil
container. Honda recommends that you use API SERVICE category SG or
later oil with the “starburst” certification mark displayed on the container.
SAE Viscosity Grade
AMBIENT TEMPERATURE
*BF8A OM-E(4763904) 01-92SC...

51
SERVICING YOUR OUTBOARD MOTOR
GEAR CASE OIL LEVEL CHECK
Check the oil level when the motor is in the vertical position. Remove the oil
level screw and see if oil flows out.
If no oil flows out, use a commercially available oil pump or squeeze tube to
fill the gear case with the gear oil recommended on page 52. Pump or squeeze
fresh oil through the OIL DRAIN screw hole until oil begins flowing out through
the OIL LEVEL screw hole.
If there is water in the oil, the water will flow out first when the oil...

52
SERVICING YOUR OUTBOARD MOTOR
GEAR CASE OIL CHANGE
Recommended oil :API standard (GL-4/5)
SAE 90 outboard motor gear oil
Oil Capacity :0.24 US qt (0.23 S, 0.20 lmp qt)
Remove the oil level screw and drain screw and allow the gear oil to thoroughly
drain into a suitable container.
Pump or squeeze the recommended gear oil through the OIL DRAIN screw
hole until oil starts flowing out through the OIL LEVEL screw hole.
Use new sealing washers. Install the oil level screw first and then the oil drain
screw....

53
SERVICING YOUR OUTBOARD MOTOR
LUBRICATION POINTS
Apply marine waterproof grease to the following parts:
Lubrication interval:
20 operating hours or one month after date of purchase or initial use, then
every 100 operating hours or 6 months.
Apply Honda Marine Corrosion Inhibitor (or equivalent) to all areas under the
engine cover and any exposed metal surfaces except the belt.
To prevent corrosion, apply anticorrosion oil to pivot surfaces where grease
cannot penetrate.
NOTICE
CLAMP SCREWS
SWIVEL...

54
SERVICING YOUR OUTBOARD MOTOR
SPARK PLUG SERVICE
Recommended spark plug: DR-5HS (NGK)
Incorrect spark plug can cause engine damage.
1. Remove the engine cover (p. 48).
2. Disconnect the spark plug cap from the spark plug.
3. Remove the spark plug with a spark plug wrench and screwdriver supplied
in the tool kit.
4. Inspect the spark plug. Replace it if the electrode is worn, or if the insulator
is cracked or chipped.
5. Measure the spark plug electrode gap with a wire-type feeler gauge.
Correct the...

55 SERVICING YOUR OUTBOARD MOTOR
6. Check that the spark plug washers are in good condition, and thread the
spark plugs in by hand to prevent cross-threading.
7. After the spark plugs are seated, tighten with a spark plug wrench to
compress the washers.
If reinstalling a used spark plugs, tighten 1/8–1/4 turn after the spark plug
seats to compress the washers.
If installing a new spark plugs, tighten 1/2 turn after the spark plug seats
to compress the washers.
Loose spark plugs can overheat and damage...

56 SERVICING YOUR OUTBOARD MOTOR
1. Disconnect the fuel tank line from the motor.
2. Remove the engine cover, and remove the fuel filter. Before removing the
filter, place commercially available hose clips on the fuel hoses on each
side of the filter to prevent fuel leakage.
3. Install the new fuel filter with the arrow mark pointing toward the carburetor.
Fuel flow will be impeded if the filter is installed backward.
4. If loss of power or hard starting is found to be caused by excessive water
or...

57
RECOIL STARTER ROPE
SERVICING YOUR OUTBOARD MOTOR
RECOIL STARTER ROPE INSPECTION
Inspect the recoil starter rope, and
replace it if it becomes frayed.
Always keep the tool kit’s emer-
gency starter rope on the boat in
case the recoil starter rope fails.
ANODE REPLACEMENT
The anode is made of a sacrificial
material that helps to protect the
outboard motor from corrosion.
Replace the anode when it has been
reduced to about half its original
size, or if it is crumbling.
Painting or coating the anode...

58 SERVICING YOUR OUTBOARD MOTOR
SHEAR PIN AND PROPELLER REPLACEMENT
A shear pin is used to protect the propeller and drive mechanism from damage
when the propeller strikes an obstruction.
The propeller blades may have sharp edges, so wear heavy gloves to
protect your hands.
1. Remove the cotter pin, the propeller cap, and the propeller.
2. Remove the broken shear pin and replace it with a new one.
3. Install the propeller, then install the propeller cap finger tight.
4. Install a new cotter pin, and...