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3. Pull the tab on the spark arrestor cover out of the muffler.
Remove the spark arrestor cover.
4. Remove the spark arrestor screen from the spark arrestor cover.
5. Clean the spark arrestor screen with a wire brush or replace it.
6. Reinstall the spark arrestor screen, spark arrestor cover and
screw.
CLEANING
Use a small brush to clean off the outside of the unit. Do not use strong
detergents. Household cleaners that contain aromatic oils such as pine and
lemon, and solvents such as kerosene, can damage plastic housing or
handle. Wipe off any moisture with a soft cloth.
STORAGE
• Never store the unit with fuel in the tank where fumes may reach
an open flame or spark.
• Allow the engine to cool before storing.
• Lock up the unit to prevent unauthorized use or damage.
• Store the unit in a dry, well-ventilated area.
• Store the unit out of the reach of children.
LONG TERM STORAGE
1. Drain all gasoline from the gas tank into a container. Do not
use gas that has been stored for more than 60 days. Dispose
of the old gasoline in accordance to Federal, State, and Local
regulations.
2. Start the engine and allow it to run until it stalls. This ensures
that all gasoline has been drained from the carburetor.
3. Allow the engine to cool. Remove the spark plug and put 5
drops of high quality motor oil into the cylinder. Pull the starter
rope slowly to distribute the oil. Reinstall the spark plug.
NOTE: Remove the spark plug and drain all of the oil from the
cylinder before attempting to start the trimmer after
storage.
4. Change the oil, referring to Changing the Oil. Dispose of the
old oil in accordance to Federal, State and Local regulations.
5. Thoroughly clean the unit and inspect for any loose or
damaged parts. Repair or replace damaged parts and tighten
loose screws, nuts or bolts. The unit is ready for storage.
TRANSPORTING
• Allow the engine to cool before transporting.
• Secure the unit while transporting.
• Drain the gas tank before transporting.
• Tighten gas cap before transporting.
9
MAINTENANCE AND REPAIR INSTRUCTIONS
• To increase clearance, turn the adjusting nut counterclockwise.
• To decrease clearance, turn the adjusting nut clockwise.
b. Recheck both clearances, and adjust as necessary.
11. Reinstall the rocker arm cover using a new gasket. Torque the
screw to 20–30 in•lb (2.2–3.4 N•m).
12. Reinstall the engine cover. Check alignment of the cover before
tightening the screws. Tighten screws.
13. Reinstall the muffler cover. Slip the rear tab on the muffler
cover into the engine cover rear slot. Then slide the remaining
slots into the tabs until they snap into place (Fig. 32).
14. Check the spark plug and reinstall. See Replacing the Spark
Plug.
15. Replace the spark plug wire.
REPLACING THE SPARK PLUG
Use a replacement part number 791-180852B spark plug. The
correct air gap is 0.025 in. (0.635 mm.). Remove the plug after
every 25 hours of operation and check its condition.
1. Stop the engine and allow it to cool. Grasp the plug wire firmly
and pull the cap from the spark plug.
2. Clean dirt from
around the spark
plug. Remove the
spark plug from the
cylinder head by
turning a 5/8 in.
socket
counterclockwise.
3. Replace cracked, fouled or dirty spark plug. Set the air gap at
0.025 in. (0.635 mm.) using a feeler gauge (Fig. 38).
4. Install a correctly-gapped spark plug in the cylinder head. Turn
the 5/8 in. socket clockwise until snug.
If using a torque wrench torque to: 110-120 in.•lb. (12.3-13.5 N•m)
Do not over tighten.
SPARK ARRESTOR MAINTENANCE
1. Remove the muffler
cover. See Rocker
Arm Clearance.
2. W
ith a flat blade
screwdriver or Torx T-
20 bit, remove the
screw attaching the
spark arrestor cover to
the muffler (Fig. 39).
WARNING:
To prevent serious personal injury, make
sure the cutting attachment has stopped rotating before
you turn it off and set it down.
Fig. 38
0.025 in.
(0.635 mm.)
Fig. 39
Spark Arrestor Screen
Slot
Muffler
Tab
Spark Arrestor Cover
Screw
WARNING:
To avoid serious personal injury, always
turn your unit off and allow it to cool before you clean or
service it.
CAUSE ACTION
Empty fuel tank Fill fuel tank with fuel
Primer bulb wasn't pressed enough
Press primer bulb fully and slowly 10 times
On/Off control in the STOP position Turn On/Off control to ON
Old fuel Drain gas tank and add fresh fuel
Fouled spark plug Replace or clean the spark plug
Plugged spark arrestor Clean or replace spark arrestor
TROUBLESHOOTING
ENGINE WILL NOT START
CAUSE ACTION
Air filter is plugged Replace or clean the air filter
Old fuel Drain gas tank and add fresh fuel
Improper carburetor adjustment Adjust according to the Carburetor Adjustments section
ENGINE WILL NOT IDLE