Craftsman 316.79192 - Manual (Page 10)

10
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.
2. Clean around the spark plug.
Remove the spark plug from the
cylinder head by turning a 5/8-inch
socket counterclockwise.
3. Replace a cracked, fouled or dirty
spark plug. Set the air gap at
0.020 in. (0.5 mm) using a feeler gauge (Fig. 24).
4. 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.
5. 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.
2. Start the engine and allow it to run until it stalls. This
ensures that all fuel has been drained from the carburetor.
3. 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.
4. 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. 23).
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. 6).
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. 9).
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).
2. 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.
23). Turn the idle speed screw in, clockwise, 1/8 of a turn
at a time (as needed) until the engine idles smoothly.
3. If the cutting head is spinning at idle , 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. 24
Spark Plug
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.
WARNING: The cutting attachment may spin
during idle speed adjustments. Wear protective
clothing and observe all safety instructions to
prevent serious personal injury.
5. Reinstall the spark arrestor screen by putting the “raised”
portion of the screen inside the recessed hole of the muffler.
Make sure that the spark arrestor screen fits flat against the
muffler.
6. Place the spark arrestor plate on top of the spark arrestor
screen with the raised side up and the opening facing
toward the engine (Fig. 22).
7. Place the spark arrestor hood on top of the spark arrestor
plate with the “raised” side up and the opening facing
AWAY from the engine (Fig. 22). Verify that the exhaust will
be directed AWAY from the engine.
8. Replace the screw you removed in Step 2 and tighten it
securely.
9. Reinstall the air filter/muffler cover (Fig. 17).
Idle
Speed
Screw
Fig. 23
MAINTENANCE & REPAIR INSTRUCTIONS
WARNING: If the spark arrestor hood and spark
arrestor screen are not tightened securely, they could
fall off causing damage to the unit and possible
serious personal injury.