Kohler K91 Service Manual page 58

S ensitivity Adjustment
Governor sensitivity is adjusted by repositioning the
governor spring in the holes in the governor arm .
If set too sensitive , speed surging will occur with
any change in load . If a considerable speed drop
occurs with the application of a load, sensitivity is
set too low. The governor spring is placed in the
third hole from the end of the governor arm when
the engine leaves the factory. To increase gover­
nor control sensitivity , move the spring to a hole
closer to the cross shaft . To decrease sensitivity,
move it to a hole farther from the cross shaft .
Sensitivity adjustment may not cure a hunting
problem in all cases. If hunting persists after sen­
sitivity is adjusted , try one or more of the following
steps .
1 . Set spark plug point gap to . 020 " and readjust
the carburetor for peak performance . (See
.. Carburetor Adjustment " subsection of this
section . )
6 . 32
2 . Stop the engine and check for free movement
of the governor linkage from idle to full open
throttle. Remove excess paint from the gover­
nor spring and make sure that there is no in­
terference between governor components and
other parts .
3 . With the engine shut down the throttle will be
in the wide open pOSition . Adjust the governor
linkage so that there is approximately 1 13 2 " of
space between the throttle lever and carbure­
tor body.
4 .
Use a tachometer t o set t h e idle speed to
1 680 RPM with the throttle lever against the
idle speed screw.
If hunting still occurs , move the governor spring to
the last hole in the governor arm . If this improves
governing but permits too great a speed reduction
when going from no load to full load , move the
spring up one position in the arm .