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