Then slowly turn the needle in until the engine runs
smoothly. Always favor a slightly rich mixture rather than
a lean setting.
It may be necessary to reset the idle speed stop
screw after the correct idle mixture is obtained.
FIG. 30. Idle Fuel Mixture Adjustment
discharge outlet. If the system is in good condition, a
quick steady stream will flow from the outlet when the
throttle is opened.
CHECKING AND ADJUSTING FUEL LEVEL
To check the fuel level, remove the power valve
FIG. 29. Power Fuel System
diaphragm cover and valve assembly. Place the 6"
IDLE SPEED ADJUSTMENT
depth gauge In this opening and crank the engine.
A stop screw controls the engine Idle speed.
Measure the distance from the machined surface to the
Run the engine until normal operating temperature has
exact fuel surface.
been reached. Turn the idle stop screw "in" to increase
If the fuel level is not to specifications, remove
the engine speed and "out" to decrease the engine
the fuel bowl and carefully bend the tab on the float to
correct the fuel level setting.
ADJUSTING THE ACCELERATING PUMP STROKE
AND CHECKING THE PUMP
The quantity of fuel discharged by the
Remove the air cleaner.
accelerating pump is controlled by changing the position
accelerator rod, choke wire, fuel line, and the distributor
of the pump link in the throttle lever holes. The inner
vacuum line. Remove the carburetor hold-down nuts,
hole is for average or hot weather operation, and the
then remove the carburetor and gasket from the
outer hole is for cold weather operation.
To check the accelerating pump, remove the air
cleaner, then operate the throttle and observe the fuel
flow from the
FIG. 31. Testing Wet Fuel Level