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| Trouble |
| Possible Cause |
| Remedy | |
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| 1. | Spark plug(s) fouled or incorrect | 1. | Inspect spark plug(s). Clean or |
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| type. |
| replace with recommended type. |
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| 2. | Fuel system obstructed. | 2. | Check for pinched or kinked fuel |
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| line or other obstructions in fuel |
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| system. |
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| 3. | Fuel contaminated or stale. | 3. | Fill tank with clean, fresh fuel. |
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| 4. | Fuel filter clogged. | 4. | Clean or replace filter. |
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| 5. | Failed ignition parts. | 5. | Have serviced by a Yamaha |
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| dealer. |
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| 6. | Warning system activated. | 6. | Find and correct cause of warning. |
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| 7. | Spark plug gap incorrect. | 7. | Inspect and adjust as specified. |
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| 8. | Poor connections or damaged | 8. | Check wires for wear or breaks. |
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| ignition wiring. |
| Tighten all loose connections. |
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| Replace worn or broken wires. |
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| 9. | Specified engine oil not used. | 9. | Check and replace oil as specified. |
C. Engine idles | 10. | Thermostat faulty or clogged. | 10. | Have serviced by a Yamaha | ||
irregularly or stalls. |
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| dealer. | ||
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| 11. | Carburetor adjustments incorrect. | 11. | Have serviced by a Yamaha |
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| dealer. |
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| 12. | Fuel pump damaged. | 12. | Have serviced by a Yamaha |
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| dealer. |
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| 13. | Air vent screw on the fuel tank | 13. | Open the air vent screw. |
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| closed. |
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| 14. | Choke knob pulled out. | 14. | Return to home position. |
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| 15. | Motor angle too high. | 15. | Return to normal operating |
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| position. |
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| 16. | Carburetor clogged. | 16. | Have serviced by a Yamaha |
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| dealer. |
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| 17. | Fuel joint connection incorrect. | 17. | Connect correctly. |
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| 18. | Throttle valve adjustment incorrect. | 18. | Have serviced by a Yamaha |
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| dealer. |
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| 19. | Battery lead disconnected. | 19. | Connect securely. |
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