Yamaha Z250D Owner's Manual page 205

Trouble
C. Engine idles
irregularly or stalls.
D. Warning buzzer
sounds or indicator
lamp lights.
E. Engine power loss.
Possible Cause
8. Poor connections or damaged ignition
wiring.
9. Specified engine oil not used.
10. Thermostat faulty or clogged.
11. Fuel pump damaged.
12. Motor angle too high.
13. Fuel joint connection incorrect.
14. Throttle valve adjustment incorrect.
15. Battery lead disconnected.
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.
10. Excess water in fuel filter cup.
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.
Remedy
8. Check wires for wear or breaks.
Tighten all loose connections.
Replace worn or broken wires.
9. Check and replace oil as specified.
10. Have serviced by a Yamaha dealer.
11. Have serviced by a Yamaha dealer.
12. Return to normal operating position.
13. Connect correctly.
14. Have serviced by a Yamaha dealer.
15. Connect securely.
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.
10. Drain filter cup.
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.
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