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REPLACING THE SPARK PLUG

Use a Champion RDJ7Y spark plug or equivalent. 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 boot
firmly and pull it from the spark plug.

Clean around the spark plug.
Remove the spark plug from the
cylinder head by turning a 5/8-inch
socket counterclockwise.

Replace a cracked, fouled or dirty
spark plug. Set the air gap at

0.020

in. (0.5 mm)

using a feeler gauge (Fig. 21).

Install a correctly-gapped spark plug in the cylinder head.
Tighten by turning the 5/8-inch 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.

Reattach the plug boot.

TRANSPORTING

• Allow the engine to cool before transporting.
• Drain fuel from unit.
• Tighten fuel cap before transporting.
• Secure the unit while transporting.

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 a fueled unit where fumes may reach an open

flame or spark.

• Allow the engine to cool before storing.
• Store the unit locked up 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

If you plan on storing the unit for an extended time, use the
following storage procedure:
1.

Carefully drain the fuel tank by running the unit dry or
remove fuel cap and tip the motor housing over and drain
oil/gas fuel into a container with the same 2-cycle fuel
mixture. Do not use fuel that has been stored for more than
60 days.

Start the engine and allow it to run until it stalls. This
ensures that all fuel has been drained from the carburetor.

Allow the engine to cool. Remove the spark plug and put 1
oz. (30 ml) of any high quality motor oil or 2-cycle 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.

Thoroughly clean the unit and inspect it for any loose or
damaged parts. Repair or replace damaged parts and
tighten loose screws, nuts or bolts. The unit is ready for
storage.

CARBURETOR ADJUSTMENT

The idle speed of the engine is adjustable through the air
filter/muffler cover (Fig. 20).

NOTE:

Careless adjustments can

seriously damage your unit.
Contact a Sears or other
qualified service dealer to
make carburetor adjustments.
Call 1-800-4-MY-HOME

for

more information.

Check Fuel Mixture

Old and/or improperly mixed fuel is
usually the reason for improper unit performance. Drain and
refill the tank with fresh, properly-mixed fuel prior to making any
adjustments. Refer to

Oil and Fuel Information

(p. 5).

Clean Air Filter

The condition of the air filter is important to the operation of the
unit. A dirty air filter will restrict air flow and change the air/fuel
mixture. This is often mistaken for an out of adjustment
carburetor. Check the condition of the air filter before adjusting
the idle speed screw. Refer to

Air Filter Maintenance

(p. 8).

Adjust Idle Speed Screw

If, after checking the fuel mixture and cleaning the air filter, the
engine still will not idle, adjust the idle speed screw as follows:
1.

Start the engine and let it run at a high idle for a minute to
warm up. Refer to

Starting/Stopping Instructions

(p. 6).

Release the throttle trigger and let the engine idle. If the
engine stops, insert a small phillips or flat blade
screwdriver into the hole in the air filter/muffler cover (Fig.
20). Turn the idle speed screw in,

clockwise

, 1/8 of a turn

at a time (as needed) until the engine idles smoothly.

If the engine appears to be idling too fast, turn the idle
speed screw

counterclockwise

1/8 of a turn at a time (as

needed), to reduce idle speed.

Checking the fuel mixture, cleaning the air filter, and adjusting
the idle speed should solve most engine problems. If not, have
the carburetor adjusted by a Sears or other qualified service
dealer. Call 1-800-4-MY-HOME

for more information.

0.020 in.

(0.5 mm)

Fig. 21

Spark Plug

MAINTENANCE & REPAIR INSTRUCTIONS

WARNING:

Do not sand blast, scrape or clean

spark plug electrodes. Grit in the engine could
damage the cylinder.

WARNING:

To avoid serious personal injury,

always turn your trimmer off and allow it to cool
before you clean or maintain it.