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CARBURETOR ADJUSTMENTS
^^WARNING
If any adjustments are made to the engine
while the engine is running (e.g,, carbure¬
tor), disengage all clutches and blades.
Keep clear of all moving parts and be careful
of heated surfaces and muffler.
A
WARNING
To avoid injury or an accident, be sure the
brake pedal is in the locked position,
transmission is in neutral, and any equip¬
ment is disengaged before starting engine to
make carburetor adjustments.
A
WARNING
Carbon monoxide fumes can be fatal! Do
not make any adjustments to the carburetor
in a confined area such as a storage build¬
ing. Move the tractor outside into the air.
■I^NOTE
The tractors covered in this manual are
equipped with a fixed-jet carburetor.
The carburetor is adjusted at the factory and under
normal operating conditions it will not require readjust¬
ing. However, if the engine does not operate properly,
what may appear to be a faulty carburetor adjustment
is in many cases a clogged air filter. This possibility
should be ruled out before attempting to readjust car¬
buretor. Refer to "MAINTENANCE" section In this
manual.
To prevent possible damage to the carburetor nee¬
dles, be very careful closing the carburetor needles
before basic adjustments are made. Improper adjust¬
ment of the carburetor may result in engine damage.
IDLE SPEED ADJUSTMENT
Run engine at maximum governed, no load speed for
a minimum of 30 seconds, then allow engine speed to
fall to idle or put throttle into idle position. Set engine
speed to 1200 (+ or -75 RPM) by turning the idle
speed screw in or out. (See Figure 30.)
IDLE FUEL ADJUSTMENT
Set the idle fuel mixture by turning the idle fuel screw
out, from the closed position, 3/4 to 1-1/4 turns. (See
Figure 30.)
Figure 30.
Fixed-Jet Carburetor
1.
Idle Fuel Adjustment Screw
2.
Idle Speed Adjustment Screw
21
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