TROUBLESHOOTING
PROBLEM | POSSIBLE CAUSE | SOLUTION | |||
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Engine will not start: | 1. | No spark. | 1. | To check for spark: Disconnect the spark plug | |
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| wire. Reattach the spark plug wire and lay spark | |
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| plug on metal cylinder. Pull the starter rope and | |
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| watch for spark at spark plug tip. If there is no | |
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| spark, repeat test with a new spark plug. | |
| 2. | No fuel. | 2. | Push primer bulb until bulb is full of fuel. If | |
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| bulb does not fill, primary fuel delivery system | |
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| is blocked. Contact a service dealer. If primer | |
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| bulb fills, engine may be flooded (see next | |
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| item). | |
| 3. | Flooded engine. | 3. | Remove spark plug, turn trimmer so spark plug | |
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| hole is aimed at the ground. Move choke lever | |
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| to “RUN” and pull starter cord 10 to 15 times. | |
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| This will clear excess fuel from engine. Clean | |
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| and reinstall spark plug. Pull starter three | |
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| times with choke lever at “RUN”. If engine | |
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| does not start, move choke lever to “CHOKE” | |
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| and repeat normal starting procedure. If engine | |
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| still fails to start, repeat procedure with a new | |
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| spark plug. | |
| 4. | Starter rope pulls harder now than | 4. | Contact a service dealer. | |
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| when new. |
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Engine starts but will not | Carburetor requires adjustment. | Contact a service dealer. | |||
accelerate: |
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Engine starts but will only | Carburetor requires adjustment. | Turn mixture needle counterclockwise 1/16 turn. | |||
run at high speed at half |
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| See Figure 18. | ||
choke: |
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Engine does not reach full | 1. | Check oil fuel mixture. | 1. | Use fresh fuel and the correct | |
speed and emits excessive | 2. | Air filter dirty. | 2. | Clean air filter. Refer to “Replacing and | |
smoke: |
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| Cleaning Air Filter” earlier in this manual. | |
| 3. | Carburetor requires adjustment. | 3. | Turn mixture needle clockwise 1/16 turn. See | |
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| Figure 18. | |
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Engine starts, runs, and | Carburetor requires adjustment. | Turn idle speed screw clockwise to increase idle | |||
accelerates but will not |
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| speed. See Figure 18. | ||
idle: |
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String will not advance: | 1. | String welded to itself. | 1. | Lubricate with silicone spray. | |
| 2. | Not enough string on spool. | 2. | Install more string. Refer to “String Replace- | |
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| ment” earlier in this manual. | |
| 3. | String worn too short. | 3. | Pull strings while alternately pressing down on | |
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| and releasing spool retainer. | |
| 4. | String tangled on spool. | 4. | Remove string from spool and rewind. Refer to | |
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| “String Replacement” earlier in this manual. | |
| 5. | Engine speed too slow. | 5. | Advance string at full throttle. | |
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Page 14
