MTD AC3 - Manual (Page 37)

Fuel System And Carburetor
33
2. In the second frame, the throttle has been rotated
slightly (tip-in), admitting some air through the rotary
valve. See Figure 5.10.
3. At mid-range throttle, the throttle is rotated so that the
bore is nearly aligned with the throat of the carbure-
tor. See Figure 5.11.
4. At wide-open throttle (WOT), the throttle is rotated so
that the bore is in-line with the throat of the carbure-
tor. See Figure 5.12.
5. As the throttle opens, it also climbs-up a ramp.
Figure 5.10
Throttle opening
Figure 5.11
Throttle opening
Figure 5.12
Throttle fully open Fuel metering
needle