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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. | |
| 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. | |
| 3. | Fuel contaminated or stale. | 3. | Fill tank with clean, fresh fuel. | |||
| 4. | Fuel filter clogged. | 4. | Clean or replace filter. | |||
| 5. | Failed ignition parts. | 5. | Have serviced by a Yamaha | |||
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| dealer. | |
| 6. | Warning system activated. | 6. | Find and correct cause of warning. | |||
| 7. | Spark plug gap incorrect. | 7. | Inspect and adjust as specified. | |||
| 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. | |
C. Engine idles | 9. | Specified engine oil not used. | 9. | Check and replace oil as specified. | |||
10. | Thermostat faulty or clogged. | 10. | Have serviced by a Yamaha | ||||
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| 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. | |
| 12. | Fuel pump damaged. | 12. | Have serviced by a Yamaha | |||
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| dealer. | |
| 13. | Air vent screw on the fuel tank | 13. | Open the air vent screw. | |||
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| closed. |
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| 14. | Motor angle too high. | 14. | Return to normal operating | |||
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| position. | |
| 15. | Carburetor clogged. | 15. | Have serviced by a Yamaha | |||
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| dealer. | |
| 16. | Fuel joint connection incorrect. | 15. | Connect correctly. | |||
| 17. | Throttle valve adjustment incorrect. | 17. | Have serviced by a Yamaha | |||
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| dealer. | |
| 18. | Battery lead disconnected. | 18. | Connect securely. | |||
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