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i ii ii iiii i i iiiiiiii i i i HIIIIIIIIIIIIIIIIII
SERVICE AND ADJUSTMENTS
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CARBURETOR ADJUSTMENTS
Carburetor adjustment is critical and if done improperly can permanently damage the engine as well as the carbure-
tor. Please read all instructions and consult theTroubleshooting section of this manual before beginning this process.
Ifthe engine does not operate according to these instructions after repeating the adjusting steps, do not use the unit.
Call the 1-800 number listed on the front of this manual for further assistance or take itto your nearest Sears Service
Center/Department.
If engine does not start, it may be flooded. If in doubt, LOWSPEED _,_
read the section on flooded engine in the starting section MIXTURE IDLESPEED
of this manual prior to beginning any adjustments. ADJUSTMENT ADJUSTMENT
If you are unsure about adjusting the carburetor or expe-
rience any problem while attempting this process, please
call the 1-800 number Iisted on the front cover of this
manual for further assistance,
The carburetor has been adjusted at the factory for sea
teve! conditions. Adjustments may become necessary if
the unit is used at significantly higher altitudes or if you
notice any of the following conditions:
• Engine will not continue to run at idle position. See
"Idle speed adjustment."
• Blade continues to move when the engine idles. See
"idle speed adjustment."
• Engine dies or hesitates when it should accelerate.
See "Acceleration check."
• Loss of cutting power which cannot be corrected by
cleaning the air filter. See "High speed adjustment."
NOTE: Do not attempt to turn the adjustments beyond
the stops as damage can occur.
WARNING:
MAKE CARBURETOR ADJUSTMENTS
WITH THE LOWER END SUPPORTED TO
PREVENT BLADE FROM CONTACTING
ANY OBJECT. HOLD UNIT WITH YOUR
HAND.
THE BLADE WILL BE SPINNING DURING
MOST OF THIS PROCEDURE. WEAR
YOUR PROTECTIVE EQUIPMENT AND
OBSERVE ALL SAFETY PRECAUTIONS.
IN "LOW SPEED MIXTURE ADJUSTMENT"
RECHECK IDLE SPEED AFTER EACH
ADJUSTMENT. THE CUTTING BLADE
MUST NOT MOVE AT IDLE SPEED.
CARBURETOR PRESETS (Fig. 17)
NOTE: In most cases, your engine can be made to run
properly with minor carburetor adjustments. Refer to trou-
ble shooting suggestions above for the condition you are
experiencing and follow the instructions. The basic carbu-
retor settings are provided in the fo!lowing instructions.
• Turn low speed adjustment and high speed adjustment
counterclockwise to the limiter stops. Do not attempt to
turn beyond the stops as damage can occur.
• Turn the idle speed adjustment clockwise I furlturn.
HIGH SPEED
MIXTURE
Figure 17
ADJUSTING PROCEDURE
Screwswith
LirniterCaps
H L
PREPARATION
• Use a fresh fuel mix. See the Fueling section.
• Start the engine. Trim hedges for 3 minutes to warm
engine. The engine must be at operating temperature
before carburetor adjustments can be performed cor-
rect/y.
IDLE SPEED ADJUSTMENT
• Allow engine to idle.
• Adjust idle speed until the engine continues to run
without stalling and without blade moving.
- Turn idle speed adjustment clockwise to increase
engine speed if the engine stalls or dies.
- Turn idle speed adjustment counterclockwise to slow
engine down and/or to keep blade from moving.
• No further adjustments are necessary if the blade does
not move at idle speed and if performance is satis-
factory.
-13-
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