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| Trouble |
| Possible Cause |
| Remedy | |
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| 1. | Propeller damaged. | 1. | Have propeller repaired or replaced. |
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| 2. | Propeller pitch or diameter incorrect. | 2. | Install correct propeller to operate out- |
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| board at its recommended speed |
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| (r/min) range. |
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| 3. | Trim angle incorrect. | 3. | Adjust trim angle to achieve most effi- |
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| cient operation. |
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| 4. | Motor mounted at incorrect height on | 4. | Have motor adjusted to proper transom |
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| transom. |
| height. |
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| 5. | Warning system activated. | 5. | Find and correct cause of warning. |
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| 6. | Boat bottom fouled with marine growth. | 6. | Clean boat bottom. |
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| 7. | Spark plug(s) fouled or incorrect type. | 7. | Inspect spark plug(s). Clean or replace |
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| with recommended type. |
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| 8. | Weeds or other foreign matter tangled | 8. | Remove foreign matter and clean lower |
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| on gear housing. |
| unit. |
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| 9. | Fuel system obstructed. | 9. | Check for pinched or kinked fuel line or |
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| other obstructions in fuel system. |
E. Engine power loss. | 10. | Fuel filter clogged. | 10. | Clean or replace filter. | ||
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| 11. | Fuel contaminated or stale. | 11. | Fill tank with clean, fresh fuel. |
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| 12. | Spark plug gap incorrect. | 12. | Inspect and adjust as specified. |
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| 13. | Poor connections or damaged ignition | 13. | Check wires for wear or breaks. |
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| wiring. |
| Tighten all loose connections. |
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| Replace worn or broken wires. |
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| 14. | Failed ignition parts. | 14. | Have serviced by a Yamaha dealer. |
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| 15. | Specified engine oil not used. | 15. | Check and replace oil with specified |
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| type. |
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| 16. | Thermostat faulty or clogged. | 16. | Have serviced by a Yamaha dealer. |
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| 17. | Air vent screw closed. | 17. | Open the air vent screw. |
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| 18. | Fuel pump damaged. | 18. | Have serviced by a Yamaha dealer. |
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| 19. | Fuel joint connection incorrect. | 19. | Connect correctly. |
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| 20. | Heat range of spark plug incorrect. | 20. | Inspect spark plug and replace it with |
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| recommended type. |
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| 21. | Engine not responding properly to shift | 21. | Have serviced by a Yamaha dealer. |
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| lever position. |
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| 1. | Propeller damaged. | 1. | Have propeller repaired or replaced. |
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| 2. | Propeller shaft damaged. | 2. | Have serviced by a Yamaha dealer. |
F. Engine vibrates | 3. | Weeds or other foreign matter tangled | 3. | Remove and clean propeller. | ||
| on propeller. |
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excessively. |
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| 4. | Motor mounting bolt loose. | 4. | Tighten bolt. |
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| 5. | Steering pivot loose or damaged. | 5. | Tighten or have serviced by a Yamaha |
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| dealer. |
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