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ADJUSTMENTS
Satisfactory generating set performance relies most-
ly on correct adjustments. If trouble does develop,
follow an orderly procedure to determine the cause
before making adjustments. Also refer to ENGINE
TROUBLESHOOTING and PERIODIC MAINTEN-
ANCE sections for help.
CARBURETOR
The generating set has a carburetor with two fuel
m i x t u r e a d j u s t m e n t s , an idle m i x t u r e w h i c h
affects operation mainly at no load and a main
adjustment which affects mixture for maximum load
(Figure 29). If your generating set has a "hunting"
(sudden surges and drops in speed) condition at no
load or full load and cannot be corrected by carbure-
tor adjustments, check governor linkage and adjust-
ments (see GOVERNOR). A hunting condition at no
load can often be c o r r e c t e d by an idle fuel
adjustment.
When operating on gaseous fuel, follow the same procedure given
for gasoline operation except for using the gas fuel adjustment
screws. Always be sure the choke is locked In its wide open
position.
When determining fuel mixture settings,
never force the fuel mixture adjustment nee-
dles against their seats, as this damages the seats and needles.
GAS IDLE
ADJUSTMENT
GAS MAIN
ADJUSTMENT
GASOLINE IDLE
ADJUSTMENT
GASOLINE MAIN
ADJUSTMENT
FIGURE 29. CARBURETOR FUEL MIXTURE ADJUSTMENTS
Main Fuel Adjustment (With Load)
1. Start generating set and allow the engine to warm
up for a minimum of 10 minutes.
2. With main adjustment needle two full turns off its
seat, slowly turn in (clockwise) until engine loses
speed.
3. Turn main adjustment needle out (clockwise)
until the engine runs smoothly at full power and
speed.
If the engine develops a slight hunting (sudden surges and drops in
speed) condition, open the main needle a little more (not more than
1/2 turn beyond maximum power point).
Idle Fuel Adjustment (No Load)
1. Start the generating set and allow set to warm up
for a minimum of 10 minutes.
2. Turn out idle adjustment screw (counterclock-
wise) until the engine loses speed. Note this
position.
3. Slowly turn in idle needle (clockwise) past the
point where the engine is running smoothly and
starts losing speed. Note this position.
4. Turn out adjustment screw midway between the
preceding two positions. The engine should run
smoothly.
Carburetor Float Adjustment
1. Disconnect throttle control, choke cable and fuel
line from carburetor.
2. With a screwdriver, remove the three screws on
the top of the carburetor and lift off.
3. With the carburetor casting inverted and the float
resting lightly against the needle and seat, there
should be 5/16-inch clearance (7.94 mm) bet-
ween the bowl cover gasket and the free end of
the float (side opposite needle and seat). See
Figure 30.
G A S K E T
THIS DIMENSION
SHOULD BE 5/16" (7.94 mm)
FIGURE 30. CARBURETOR FLOAT SETTING
2 0
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