TM 10-3950-206-12
Figure 4-26. Carburetor adjustment points.
(7) If engine speed is not between 450 and
4-43. Governor Adjustment
500 rpm, reset engine idle speed as directed in (5)
a. Back out surge screw (fig. 4-27) until only 3 to 4
above.
threads hold, then lock with locknut.
(8) If any idle speed readjustment is
b. Connect an electric tachometer to engine.
necessary, readjust idle mixture as directed in (6) above.
c. Start engine and idle 450 to 500 rpm until
b. Removal.
warmed to operating temperature.
(1) Loosen hose clamp, at carburetor, and
d. Set specified high idle no load speed 2, 450 rpm
disconnect air cleaner hose.
by moving throttle to required position and adjusting high
(2) Loosen choke adjusting screw (fig. 4-26)
speed screw.
and choke cable bracket screw. Pull choke cable from
e. Check regulation by applying and removing
bracket and control lever.
engine load.
(3) Remove clip that secures linkage to throttle
(1) If regulation is too broad, increase spring
control lever; disconnect linkage.
tension with sensitivity screw and readjust high speed
(4) Disconnect fuel line.
Remove from
screw throttle stop to obtain high idle speed.
carburetor.
(2) If regulation is too narrow decrease spring
(5) Remove nuts that secure carburetor to
tension with sensitivity screw and readjust high speed
manifold; remove carburetor and gasket.
screw throttle stop to obtain desired high idle speed.
c. Installation. Reverse procedures in b above.
4-33
