Murray 11052x4D, Instruction Book

Page: 19 / 72

SERVICE AND ADJUSTMENT
19
F-031306L
HOW TO ADJUST THE CARBURETOR
A dirty air cleaner will cause the engine to
run improperly or to smoke excessively. Be-
fore adjusting the carburetor, make sure the
air cleaner is clean. Never make unneces-
sary adjustments to the carburetor. The car-
buretor was set at the factory to operate
efficiently under most applications. However,
if adjustments are required, we recommend
you contact your nearest Authorized Service
Center. If you feel that you are competent to
make carburetor adjustment proceed as fol-
lows.
WARNING: Use extreme care
when making adjustments that
require the engine to be run-
ning. Keep hands, feet, hair and loose
clothing away from all moving parts.
1. Turn the mixture adjustment screw
clockwise to until closed (see Figure 15).
IMPORTANT: To prevent damage to
the carburetor or to the adjusting
screw, tighten the adjustment screws
with your fingers.
2. Turn the mixture adjustment screw
counterclockwise one turn.
3. Start the engine and let it warm up for
approximately 3 to 5 minutes. Do not ad-
just the carburetor when the engine is
cold.
4. If the engine runs erratically or stops af-
ter the choke lever is moved to the
CHOKE OFF position, then open the
mixture adjustment screw an addition-
al 1/8 turn counterclockwise.
5. With the engine running, release the
throttle control (idle position) to make the
mixture adjustments.
6. Slowly turn the mixture adjustment
screw clockwise until the engine begins
to run erratically. Note this position.
7. Then, slowly turn the mixture adjustment
screw counterclockwise until the engine
again begins to run erratically. Note this
position.
8. Turn the mixture adjusting screw clock-
wise until it is halfway between the first
position and the second position.
9. Check the engine idle speed. Start the
engine and release the throttle control. If
the tines do not turn with the throttle con-
trol is released, the idle speed is correct.
If the tines turn with the throttle control is
released, adjust the engine idle speed as
follows.
10. Have someone tilt the cultivator back on
its depth stake so that the tines are off
the ground.
11. Start the engine.
12. With the throttle in the released (idle
position), turn the idle speed adjust-
ment screw counterclockwise until the
tines stop rotating.
WARNING: The engine gover-
nor is set at the factory. Do not
change the governor setting.
Over speeding the engine above the fac-
tory setting can be dangerous. If you
think the engine governor needs an ad-
justment, contact your nearest Autho-
rized Service Center.
Figure 15
Carburetor
Idle Speed
Adjustment Screw
Mixture
Adjustment Screw
Engine Shown With Air Filter Removed