18
8 - MAINTENANCE INSTRUCTIONS
8-5. SPARK PLUG
1. To remove spark plug B (figure 8-6A) for cleaning or
replacement: make sure engine is off, spark plug is cool
then grasp spark plug boot firmly and remove from
spark plug. Remove spark plug with correct spark plug
tool. Inspect, clean or replace as needed.
2. Spark plug gap = .025" (.635mm) (Figure 8-5A).
3. Torque to 105 to 130 inch pounds (12 to 15 N•m).
Connect spark plug boot.
8-6. SPARK ARRESTER SCREEN
1. To replace spark arrester screen (A) (Figure 8-6A), use
a needle nose pliers, pinch an edge of the spark
arrester screen. Pull the whole spark arrester screen
out.
2. Use the needle nose pliers to push in a new spark
arrester screen. Then open the pliers a little to press the
inner surface of the spark arrester screen to fasten it.
8-7. DEBRIS SHIELD KNIFE SHARPENING
1. Remove cutter knife (A) from debris shield (B) (Figure
8-7A).
2. Place knife in a bench vise. Sharpen knife using a flat
file, being careful to maintain the angle of cutting edge.
File in one direction only.
8-8. STORING A UNIT
Failure to follow these steps may cause varnish to
form in the carburetor and difficult starting or permanent
damage following storage.
1. Perform all the general maintenance recommended in
the Maintenance Section of your User Manual.
2. Clean exterior of engine, drive shaft assembly, debris
shield and stringhead.
3. Drain fuel from the fuel tank.
4. After fuel is drained, start engine.
5. Run engine at idle until unit stops. This will purge the
carburetor of fuel.
6. Allow engine to cool (approx. 5 minutes).
7. Using a spark plug wrench, remove the spark plug.
8. Pour 1 teaspoon of clean 2-cycle oil into the
combustion chamber. Pull starter rope slowly several
times to coat internal components. Replace spark plug.
9. Store unit in a cool, dry place away from any source of
ignition such as an oil burner, water heater, etc.
8-9 REMOVING A UNIT FROM STORAGE
1. Remove spark plug.
2. Pull starter rope briskly to clear excess oil from com-
bustion chamber.
3. Clean and gap spark plug or install a new spark plug
with proper gap.
4. Prepare unit for operation.
5. Fill fuel tank with proper fuel / oil mixture. See Fuel and
Lubrication Section.
17
8 - MAINTENANCE INSTRUCTIONS
8-2. AIR FILTER
CAUTION
NEVER operate trimmer without the air filter. The air filter
must be kept clean. If it becomes damaged, install a new fil-
ter.
To Clean Air Filter:
1. Remove knob (A) holding air filter cover in place,
remove cover (B) and lift filter (C) from air box (Figure
8-2A).
2. Wash filter in soap and water. DO NOT USE GASO-
LINE!
3. Air dry filter.
4. Reinstall filter.
NOTE: Replace filter if frayed, torn, damaged or unable to
be cleaned.
8-3. FUEL CAP / FUEL FILTER
CAUTION
Remove fuel from unit and store in approved container
before starting this procedure. Open fuel cap slowly to
release any pressure which may have formed in fuel tank.
NOTE: Keep vent (A) on fuel cap clean of debris (Figure 8-
3A).
Fuel Filter:
1. Completely remove fuel cap from fuel tank (B) to be
able to remove fuel filter (C) from tank. (Figure 8-3B)
2. Pull filter (D) off with a twisting motion. (Figure 8-3C)
3. Replace fuel filter (D). (Figure 8-3C)
NOTE: Never operate the trimmer without the fuel filter.
Internal engine damage could result!
8-4. CARBURETOR ADJUSTMENT
The carburetor was pre-set at the factory for optimum per-
formance. With the exception of idle adjustment, per sec-
tion 6-1, important idling informantion.
8-2A
A
B
C
8-3A
A
8-3B
B
C
8-3C
D
8-5A
.025" (.635mm)
8-6A
A
B
8-7A
B
A
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