TM 9-4940-421-14
(5) Remove PCV valve.
the fuel pump and gasket.
(6) Remove two bolts and two lockwashers that
(4) Remove the two bolts and two lockwashers
secure carburetor and gasket to the engine intake
that secure the adapter to the crankcase.
manifold. Remove carburetor and gasket.
c. Cleaning and Installation.
c. Cleaning aid Inspection.
(1) Clean all parts in cleaning solvent and dry
(1) Clean all metal parts in cleaning solvent and
thoroughly (app D).
dry each part thoroughly (app D).
(2) Inspect each part for evidence of cracks,
(2) Blow out all passages in the throttle body and
breaks, or other visible damage.
fuel bowl with clean dry compressed air. Reverse the
(3) Inspect the fittings and be sure that the fuel
flow of air in the passages to insure that all dirt has
lines are not damaged.
been removed. Make sure that all carbon deposits and
d. Installation. Install in reverse order of removal.
foreign matter have been removed from the throttle
bore and idle port.
d. Installaion. Install in reverse order of removal.
e. Carburetor Adjustments. Start the engine and let
it run until it reaches operating temperature. Turn idle
adjusting screw out until engine falters; slowly turn in
the screw until the engine runs smoothly. Stop the
engine. The idle adjusting screw should be in proper
adjustment at about 3/4 to a full turn open.
NOTE
Hook governor spring in hole no. 7 of governor lever.
AR 701542
a. General. The carburetor is a float type with idle
fuel adjustment. The carburetor is designed with 2 ma-
AR 701543
jor units -- a die cast aluminum throttle body and a
stamped steel fuel bowl.
f Choke Adjustment.
b. Removal.
(1) Loosen adjusting screw on butterfly arm.
(1) Disconnect choke control wire.
(2) Be sure choke control is pushed all the way in. -
(2) Disconnect governor spring.
(3) Hold butterfly in the full open position and
(3) Remove air cleaner hose.
tighten adjusting screw on butterfly arm.
(4) Disconnect fuel line at fuel pump.
Section IX. MAINTENANCE OF IGNITION COMPONENTS
b. Cleaning and Inspection.
(1) Wipe the exterior of the spark plugs clean with
a. Rernoval. Disconnect the cable assembly from the
spark plugs. Clean out the spark plug wells in the
a cloth dampened with cleaning solvent.
(2) Examine the firing ends of the plugs noting
cylinder heads and remove the spark plugs with the
the type of deposit. Wet, sludgy deposits indicate ex-
spark plug wrench.
