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Cmean Air Fimter
The condition of the air fiiter is important to the operation
of the unit, A dirty air fiiter will restrict air flow and
change the air/fuei mixture, This is often mistaken for an
out of adjustment carburetor, Check the condition of the
air fiiter before adjusting the idb speed screw, Refer to
Air Filter Maintenance,
Adjust Idle Speed Screw
If, after checking the fue[ mixture and cieaning the air
fiiter, the engine still[ will[ not idie, adjust the idie speed
screw as foiiows:
1, Start the engine and bt it run at a high idle for a
minute to warm up, Refer to Stardng/Sto,oping
Instructions.
WARNmNG: The cutting
attachment will spin
during idle speed adjustments. Wear
protective clothing and observe all safety
instructions to prevent serious personal injury.
2, Release the throttle trigger and let the engine idle, If
the engine stops, insert a small phillips screwdriver
into the hob in the air filter/muffler cover (Fig, 27).
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 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 and all of the following are true:
the engine wiii not idle
the engine hesitates or staiis on acceleration
there is a loss of engine power
Have the carburetor adjusted by an authorized service
dealer.
To prevent serious
personal injury,
make sure the cutting attachment has
pped rotating after you turn it off and
fou set it down.
REPLACING THE SPARK PLUG
Use a Champion RDJ7Y spark plug, or equiw_ient. The
correct air gap is 0.020 inch (0.5 rnrn}. Remove the plug
after every 25 hours of operation and check its condition.
1. Stop the engine and aiiow it to cooi. Grasp the plug
wire 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 ram} using a feeler gauge
(Fig. 28).
Idle Speed Screw
the cylinder.
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.,ib. (12.3-13.5 N,m}
Do not over tighten.
Fig. 27
f
Fig. 28
15