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MAINTENANCE & REPAIR INSTRUCTIONS
CARBURETOR ADJUSTMENT
The idle speed of the engine is adjustable through the air
filter/muffler cover (Fig. 37).
NOTE: Careless adjustments can seriously damage your
unit. An authorized service dealer should make
carburetor adjustments.
Check Petrol Mixture
Old and/or improperly mixed petrol is usually the reason for
improper unit performance. Drain and refill the tank with
fresh, properly-mixed petrol prior to making any
adjustments. Refer to Oil and Petrol 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/petrol 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 AirFilter
Maintenance.
Adjust Idle Speed Screw
If, after checking the petrol mixture and cleaning the air filter,
the engine still will not idle, adjust the idle speed screw as
follows:
WARNING: The cutting attachment may be
spinning during idle speed adjustments. Wear
protective clothing and observe all safety
instructions to prevent serious personal injury.
I.
2.
Start the engine and let it run at a high idle for a minute
to warm up. Refer to Starting/Stopping Instructions.
Release the throttle trigger and let the engine idle. Ifthe
engine stops, insert a small phillips or flat blade
screwdriver into the hole in the air filter/muffler cover
(Fig. 37). Turn the idle speed screw in, clockwise, I/8 of a
turn at a time (as needed) until the engine idles
smoothly.
I Fig. 37
Idle Speed Screw
NOTE: The cutting attachment should not rotate when
the engine idles.
3. Ifthe cutting attachment rotates when the engine idles,
turn the idle speed screw counterclockwise I/8 of a turn
at atime (as needed), to reduce idle speed.
Checking the petrol 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 will not idle
• the engine hesitates or stalls on acceleration
• there is a loss of engine power
Have the carburetor adjusted by an authorized service
dealer.
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REPLACING THE SPARK PLUG
Use a Champion RDJ7Y spark plug, or equivalent. The correct
air gap is 0.5 mm (0.020 in.). Remove the plug after every 25
hours of operation and check its condition.
I. Stop the engine and allow it to cool. 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 0.5 mm (0.020 in.) using a feeler gauge (Fig. 38).
CAUTION: Do not sand blast, scrape or clean
electrodes. Grit in the engine could damage 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:
12.3-13.5 Nom (110-120 inolb)
Do not over tighten.
I Fig. 38
0.5 mm
(0.020 in.)
18