GB
5-3
D. Warning buzzer
sounds or
indicator lamp
lights.
Trouble Possible Cause Remedy
1. Cooling system clogged 1. Check water intake for restriction.
2. Engine oil level low 2. Fill oil tank with specified engine
oil.
3. Heat range of spark plug incorrect 3. Check the plug condition and
replace it with a correct type.
4. Specified engine oil not used 4. Check and replace oil with
specified type.
5. Engine oil contaminated or 5. Replace oil with fresh, specified
deteriorated type.
6. Oil filter clogged 6. Have Yamaha dealer service.
7. Oil feed/injection pump malfunctions 7. Have Yamaha dealer service.
8. Load on boat improperly distributed 8. Distribute load to place boat on an
even plane.
9. Water pump/thermostat faulty 9. Have Yamaha dealer service.
1. Propeller damaged 1. Have propeller repaired or
replaced.
2. Propeller pitch or diameter wrong 2. Install correct propeller to operate
outboard at its recommended
r/min range.
3. Trim angle incorrect 3. Adjust trim angle to gain most
efficient operation.
4. Motor mounted at wrong height on 4. Have motor adjusted to proper
transom transom height.
5. Warning system activated 5. Find and correct cause.
6. Boat bottom fouled with marine 6. Clean boat bottom.
growth
7. Spark plug(s) fouled or wrong type 7. Inspect spark plug(s). Clean or
replace with recommended type.
8. Weeds or other foreign matters 8. Remove them and clean lower
tangled on gear housing unit.
9. Fuel system obstructed 9. Check for pinched or kinked fuel
line or other obstructions in fuel
system.
10. Fuel filter clogged 10. Clean or replace filter.
11. Fuel contaminated or stale 11. Fill tank with clean, fresh fuel.
12. Spark plug gap incorrect 12. Inspect and adjust as specified.
E. Engine power loss
6A1-9-7LA0-5 3/7/02 12:19 PM Page 168
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