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Page Title: Figure 4-5. Carburetor adjustments.
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(2) Adjust the main adjusting screw (fig. 4-5).
(c) T u r n t h e a d j u s t i n g s c r e w c o u n -
This adjustment determines the amount of fuel
terclockwise until the engine runs smoothly without
available for high-speed operation. Adjust as
missing.
follows:
(3) Adjust the idle mixture adjustment screw
(fig. 4-5). This adjustment controls the amount of
air admitted to the idling system which functions
only at low speeds. You should adjust as follows:
(a) With the engine at idle, turn the idle
mixture adjustment screw counterclockwise to cut
off air, making the fuel mixture richer until the
engine starts to run roughly due to excessively rich
mixture.
(b) Turn the adjustment screw clockwise to
obtain the smoothest idle operation possible.
(c) By observing the engine vacuum gage
on the control panel, you can adjust the screw for
the highest engine vacuum.
(4) Adjust the idle speed adjustment screw
(fig. 4-5). Turn the screw clockwise or coun-
terclockwise as necessary to provide 1400 50 rpm
idle speed when the pump throttle control is set to
idle.
b. Removal.
NOTE
Remove carburetor only if troubleshooting indicates
Figure 4-5. Carburetor adjustments.
faulty operation requiring replacement.
(a) Adjust the throttle control of the pump
(1) Disconnect the carburetor throttle lever
to set the carburetor throttle at about one-fourth
from the governor control rod linkage. Refer to
open.
(b) Turn the main adjusting screw clock-
wise to reduce the fuel to the engine until~the engine
begins to miss due to a lean fuel mixture.
Figure 4-6. Governor and carburetor linkage.

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