Kohler K91 Service Manual page 54

After making an initial adjustment or connecting a
throttle wire , set speed adjustment as follows. Re­
fer to Figure 6-42 .
1 . Start the engine and allow a few minutes for
warm u p .
2 . Open the throttle to full speed and check en­
gine speed with a tachometer. Speed should
be approximately 4000 RPM for Model K91 and
3 600 -RPM for Model K 1 6 1 or K 1 8 1 .
I f speed i s not as required . slightly loosen the
3 .
bushing nut at the speed control disc.
4 . Move the throttle bracket counterclockwise to
increase engine speed or clockwise to de­
crease speed .
5 . When proper speed i s set . tighten the bushing
n u t .
NOT E : Do n o t u s e excessive force in tightening t h e
bushing n u t . Excessive force could cause binding
or stripping of threads.
/
D E C R E A S E S P E E D
Figu re 6-4 2 . Speed Adjustment.
6 . 2 8
Figure 6-41 . Installing Throttle.
Governor "New Look" K1 81
Governor
Arm
Governor
Spring
Figure 6-43. Centrifugal Flyweight
Operation
Centrifugal force acting on the rotating governor
gear assembly causes the flyweights to move out­
ward as speed increases and inward as speed de­
creases. As the flyweights move outward they
force the regulating pin of the assembly to move
outward . The regulating pin contacts the tab on
the cross shaft , causing the shaft to rotate with
changing speed . One end of t he cross shaft pro­
trudes through the side of t he crankcase. Through
external linkage attached to the cross shaft , t he
rotating action is transmitted to the throttle plate
of carburetor.
When the engine is at rest and the throttle is in
the " fast " position , the tension of the governor
�
Throttle
Llnkage
Carburetor
Throttle Lever
/'
Throttle
Control
Mechanical Governor.
Governor Gear
High
Speed
Stop