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| Trouble |
| Possible Cause |
| Remedy | |
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| 1. | Cooling system clogged. | 1. | Check water intake for restriction. |
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| 2. | Engine oil level low. | 2. | Fill oil tank with specified engine |
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| oil. |
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| 3. | Heat range of spark plug incorrect. | 3. | Inspect spark plug and replace it |
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| with recommended type. |
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| 4. | Specified engine oil not used. | 4. | Check and replace oil with |
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| specified type. |
D. Warning buzzer | 5. | Engine oil contaminated or | 5. | Replace oil with fresh, specified | ||
sounds or |
| deteriorated. |
| type. | ||
indicator lamp | 6. | Oil filter clogged. | 6. | Have serviced by a Yamaha | ||
lights. |
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| dealer. | ||
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| 7. | Oil feed/injection pump | 7. | Have serviced by a Yamaha |
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| malfunctions. |
| dealer. |
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| 8. | Load on boat improperly distributed. | 8. | Distribute load to place boat on an |
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| even plane. |
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| 9. | Water pump/thermostat faulty. | 9. | Have serviced by a Yamaha |
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| dealer. |
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| 10. | Excess water in fuel filter cup. | 10. | Drain filter cup. |
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| 1. | Propeller damaged. | 1. | Have propeller repaired or |
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| replaced. |
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| 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. |
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| 3. | Trim angle incorrect. | 3. | Adjust trim angle to achieve most |
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| efficient operation. |
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| 4. | Motor mounted at incorrect height | 4. | Have motor adjusted to proper |
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| on transom. |
| transom height. |
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| 5. | Warning system activated. | 5. | Find and correct cause of warning. |
E. Engine power loss. | 6. | Boat bottom fouled with marine | 6. | Clean boat bottom. | ||
| growth. |
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| 7. | Spark plug(s) fouled or incorrect | 7. | Inspect spark plug(s). Clean or |
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| type. |
| replace with recommended type. |
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| 8. | Weeds or other foreign matter | 8. | Remove foreign matter and clean |
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| tangled on gear housing. |
| lower unit. |
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| 9. | Fuel system obstructed. | 9. | 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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| 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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