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14
REPLACING THE SPARK PLUG
Use a Champion RDJ7Y spark plug. The correct air gap
is 0.020 in. (0.5 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
0.020 in. (0.5 mm)
using a feeler gauge (Fig. 18).
MAINTENANCE AND REPAIR INSTRUCTIONS
NOTE: Ensure the tines are not in contact with the
ground when adjusting the idle.
2. Release the throttle control and let the engine idle. If
the engine stops, insert a small phillips or flat blade
screwdriver into the hole in the muffler cover (Fig. 19).
Turn the idle speed screw clockwise 1/8 of a turn at
a time (as needed) until the engine idles smoothly.
NOTE:
The tines should not rotate during engine idle.
3. If the tines rotate when the engine idles, 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 screw should solve most engine
problems. If not and all the following are true:
• The engine will not idle
• The engine hesitates or stalls on acceleration
• There is a loss of engine power
Have the carburetor adjusted by a Sears Parts & Repair
center or other qualified service dealer.
CARBURETOR ADJUSTMENTS
The engine’s idle speed adjuster is adjustable through
the air filter/muffler cover (Fig 17).
NOTE:
Careless adjustment
s can seriously damage your
unit. A Sears Parts & Repair center or other
qualified service dealer should make carburetor
adjustments.
Check Fuel Mixture
Old and/or improperly mixed fuel is usually the reason
for the unit not running properly. Drain and refill the tank
with fresh, properly mixed fuel prior to making any
adjustments. Refer to Oil and Fuel Information.
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 adjuster. Refer to
Air Filter Maintenance.
Adjust Idle Speed Adjuster
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 for about 2-3 minutes
at a high speed (full throttle) to warm up. Refer to the
Starting/Stopping Instructions.
The unit will still run
during idle speed
adjustments. Wear protective clothing and
observe all safety instructions to prevent
serious personal injury.
WARNING:
Idle Speed Adjuster
Fig. 17
Fig. 16
If the exhaust
deflector assembly
is not tightened securely, it could fall off
causing damage to the unit and possible
serious personal injury.
WARNING:
Spark Arrestor
Screen
Spark Arrestor
Hood
Screw
Muffler
Engine
Tabs
Slots
0.020 in.
(0.5 mm.)
Fig. 18