MAINTENANCE AND REPAIR INSTRUCTIONS
15
6. Reinstall the filter (Fig. 25) and air filter cover.
NOTE:
If the unit is operated without the
carburetor/air filter cover assembled,
you will
VOID
the warranty.
The condition of the air filter is important to the
operation of the unit. A dirty air filter will restrict
the air flow, which upsets the fuel-air mixture in
the carburetor. The resulting symptoms are often
mistaken for an out-of-adjustment carburetor.
Therefore, check the condition of the air filter
before adjusting the carburetor. Refer to
Air Filter
Maintenance
.
If the following conditions are experienced, it may
be necessary to adjust the carburetor:
• The engine will not idle
• The engine hesitates or stalls on acceleration
• A loss of engine power that is not
corrected by new fuel or cleaning the
air filter and muffler
NOTE:
Warm up the engine for 30-60 seconds
before adjusting the carburetor.
Adjusting Carburetor
1. Clean the air filter if it is dirty. Refer to
Air
Filter Maintenance.
2. Fill the tank with clean, properly mixed fuel.
Refer to
Oil and Fuel Information
.
3. If the engine stops frequently when idling, turn
the idle speed screw
clockwise
1/2 turn until the
engine stabilizes (Fig. 29).
4. If the cutting head keeps rotating after the trigger
is released, turn the idle speed screw
counterclockwise
1/2 turn until the head stops
rotating (Fig. 29).
NOTE:
Careless adjustments can seriously
damage your unit. It is recommended
that carburetor adjustments be made
by an authorized service dealer.
Fig. 27
Fig. 28
4. Apply enough clean motor oil to lightly coat
the filter (Fig. 27).
5. Squeeze the filter to spread and remove
excess oil (Fig. 28).
CARBURETOR ADJUSTMENT
This unit is equipped with a diaphragm-type
carburetor that has been carefully calibrated at
the factory. In most cases, no further adjustment
is required
Old or improperly mixed fuel are usually the main
reasons for the unit not running properly. Drain
and refill the tank with fresh properly mixed fuel
prior to doing any adjustments. Refer to
Oil and
Fuel Information
for the proper ratio.
Fig. 29
