Yamaha E40X Owner's Manual page 174

Trouble
D. Warning buzzer
sounds or
indicator lamp
lights.
E. Engine power loss
Possible Cause
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. Propeller damaged
2. Propeller pitch or diameter wrong
3. Trim angle incorrect
4. Motor mounted at wrong height on
transom
5. Warning system activated
6. Boat bottom fouled with marine
growth
7. Spark plug(s) fouled or wrong type
8. Weeds or other foreign matters
tangled on gear housing
9. Fuel system obstructed
10. Fuel filter clogged
11. Fuel contaminated or stale
12. Spark plug gap incorrect
1. Check water intake for restriction.
2. Fill oil tank with specified engine
oil.
3. Check the plug condition and
replace it with a correct type.
4. Check and replace oil with
specified type.
5. Replace oil with fresh, specified
type.
6. Have Yamaha dealer service.
7. Have Yamaha dealer service.
8. Distribute load to place boat on an
even plane.
9. Have Yamaha dealer service.
1. Have propeller repaired or
replaced.
2. Install correct propeller to operate
outboard at its recommended
r/min range.
3. Adjust trim angle to gain most
efficient operation.
4. Have motor adjusted to proper
transom height.
5. Find and correct cause.
6. Clean boat bottom.
7. Inspect spark plug(s). Clean or
replace with recommended type.
8. Remove them 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.
5-3
GB
Remedy