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D. Warning buzzer
sounds or
indicator lamp
lights.
Trouble Possible Cause Remedy
1. Cooling system clogged.
2. Engine oil level low.
3. Heat range of spark plug incorrect.
4. Specified engine oil not used.
5. Engine oil contaminated or
deteriorated.
6. Oil filter clogged.
7. Oil feed/injection pump
malfunctions.
8. Load on boat improperly distributed.
9. Water pump/thermostat faulty.
1. Check water intake for restriction.
2. Fill oil tank with specified engine
oil.
3. Inspect spark plug and replace it
with recommended type.
4. Check and replace oil with
specified type.
5. Replace oil with fresh, specified
type.
6. Have serviced by a Yamaha
dealer.
7. Have serviced by a Yamaha
dealer.
8. Distribute load to place boat on an
even plane.
9. Have serviced by a Yamaha
dealer.
1. Propeller damaged.
2. Propeller pitch or diameter incorrect.
3. Trim angle incorrect.
4. Motor mounted at incorrect height
on transom.
5. Warning system activated.
6. Boat bottom fouled with marine
growth.
7. Spark plug(s) fouled or incorrect
type.
8. Weeds or other foreign matter
tangled on gear housing.
9. Fuel system obstructed.
10. Fuel filter clogged.
11. Fuel contaminated or stale.
12. Spark plug gap incorrect.
1. Have propeller repaired or
replaced.
2. Install correct propeller to operate
outboard at its recommended
speed (r/min) range.
3. Adjust trim angle to achieve most
efficient operation.
4. Have motor adjusted to proper
transom height.
5. Find and correct cause of warning.
6. Clean boat bottom.
7. Inspect spark plug(s). Clean or
replace with recommended type.
8. Remove foreign matter and clean
lower unit.
9. Check for pinched or kinked fuel
line or other obstructions in fuel
system.
10. Clean or replace filter.
11. Fill tank with clean, fresh fuel.
12. Inspect and adjust as specified.
E. Engine power loss.
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