3-28. CARBURETOR ADJUSTMENT. Adjust fuel
c. Check battery electrolyte with a hydrometer as
mixture and carburetor linkage as follows: (See figure
outlined below. If the reading between cells differs by
more than 0.020, replace the battery.
a. Start the engine and allow engine to warm up to
normal operating temperature.
All repairs shall be made with the ignition
switch in the OFF position and the parking
b. Set idle adjustment screw to maintain 450 to 500
rpm engine idle speed.
State of Charge
c. Adjust the idle mixture screw to the leanest
position that will allow maximum steady engine speed.
Turn clockwise for lean mixture and counterclockwise for
d. The accelerating pump lever should be placed in
proper position in accordance with climate conditions.
The short stroke position is for extremely warm weather
or for altitudes above 2,500 feet, the medium stroke
position is for normal summer weather and the long
All hydrometer readings are based on 80F
stroke position is for extremely cold weather operation.
Figure 3-4. Carburetor adjustment