Choke adjustment.

TM 10-3930-630-12

TA034822

Figure 4-47. Carburetor adjustment

Choke adjustment.

to provide correct throttle motion. Tighten lock nut.

(1)

(3) Idle Adjustment

(a) Loosen clamps and remove inlet hose

(a) Start engine and allow to reach

(fig. 4-47) from carburetor.

(b) Pull choke control knob on instrument

operating temperature. Adjust governor if necessary

(para 4-59).

panel all the way out.

(b) Adjust throttle stop screw (fig. 447) to

an idle speed of 500 to 550 rpm.

through air inlet hose opening in carburetor. Choke

plate should completely close opening to carburetor.

(d) If choke plate is not completely

(fig. 447) in until engine begins to miss. Slowly turn

screw out until engine begins to run unevenly. Count

closed, loosen clamps and move choke cable (fig. 4-47)

number of turns between two points.

until choke is completely closed. Tighten clamps.

(d) Rotate screw to bring it to

(e) Move choke control knob in and out

approximately midpoint between the two points reached

and check choke operation. Cable should operate

in (4) above, or until engine runs smoothly. Stop

smoothly and should completely close choke plate.

(f) Install air inlet hose on carburetor and

engine.

(e) Close side panel.

tighten clamps.

c. Removal

(2) Throttle Adjustment.

(a) Depress accelerator and observe

(1) Open left side panel

(2) Disconnect throttle cable (fig. 447) and

throttle cable (fig. 4-47) movement at carburetor.

(b) Release accelerator and observe

choke cable from carburetor.

(3) Loosen clamp and disconnect air inlet hose

action of return spring (fig. 4-47). Throttle cable should

from carburetor.

return carburetor to idle position. If necessary, loosen

(4) Disconnect fuel hose (17, fig. 4-45) from

lock nut and adjust spring tension with adjusting screw

carburetor.

4-56