AC3 Series of Engines
34
6. In idle position, the throttle is closed, the hole
through the drum is cross-wise to the throat of car-
buretor and the drum is seated at the bottom of its
travel. See Figure 5.13.
• Throttle closed.
• The top of the throttle arm is 5/16” (7.9mm)
above the top of the carburetor housing.
7. As the throttle drum rotates, it also climbs-up a
ramp. The rising throttle draws the fuel metering
needle out of the orifice in the venturi of the carbure-
tor. See Figure 5.14.
• Throttle at WOT.
• The top of the throttle arm is 3/8” (9.5mm)
above the top of the carburetor housing.
Figure 5.13
Throttle closed
5/16”
Figure 5.14
3/8”
Throttle open
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