GOVERNOR ADJUSTMENT
Where engine speed is governor controlled, the gov-
ernor is set at the factory to allow a nominal engine
speed of
2400
rpm at no load operation (unless
another speed is specified when the engine is
ordered). Proper governor adjustment is one of the
most important factors in maintaining the power and
speed desired from the engine.
Before making governor adjustment, run the engine
in a well ventilated area for about 15 minutes to reach
normal operating temperature.
It
is difficult to determine if, after long usage, the
governor spring has become fatigued. If, after prop-
erly making all other adjustments, the regulation is
still erratic, install a new spring (Figures
26
and 27).
A tachometer for checking engine speed is required
for accurate governor adjustment.
Check the governor arm, linkage, throttle shaft, and
!
lever for binding or excessive wear at connecting
points. A binding condition at any point
will
cause the
governor
to
act slowly and regulation will be poor.
Excessive looseness
will
cause a hunting condition,
and regulation will be erratic. Work the arm back and
forth several times by hand while the engine idles.
If
either of these conditions exist, determine the cause
and adjust or replace parts as needed.
THIS
DISTANCE
DETERMINES
SENSlTiVlTY
MORE
4
1
SENSITIVE
I
I
LESS
I
SENSITIVE
Procedure
1. Adjust the carburetor main jet for the best fuel
2.
Adjust the carburetor idle needle with no load
3.
Adjust the length of the governor linkage.
4.
Check the governor linkage and throttle shaft for
binding or excessive looseness.
5.
Adjust the governor spring tension for nominal
engine speed at no load operation.
6.
Check the rpm drop between no load and full load
operation, and adjust the governor sensitivity as
needed (should be about
8%).
7.
Recheck the speed adjustment.
8.
Set the carburetor throttle stop screw.
mixture at full load operation.
connected.
Linkage
The engine starts
at
wide open throttle. The length
of
the linkageconnecting the governor arm
to
the throt-
tle arm is adjusted by rotating the ball joint housing.
Adjust the length
so
that with theenginestopped and
tension on the governor spring, the stop on the car-
buretor throttle lever is 1/32 inch
(0.794
mm) from the
carburetor stop boss. This setting allows immediate
control by the governor after starting and synchron-
izes travel of the governor arm and the throttle shaft.
THROTTLE
ARM
CARBURETOR
THROTTLE
JOINT
BALL
kt
\\
SHAFT
SPRING
STING
STUD
-GOVERNOR
ADJUSTMENT
FIGURE
26.
GOVERNOR ADJUSTMENTS
26
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