6-02
GOVERNORS
6-02
ADJUSTMENTS (Continued)
Oil Level
Remove the oil plug. If oil drips out the level is
full. If oil doesn’t drip out, remove the oil fill plug
and add low-30 or lOW-40 engine oil into the fill
hole until it starts dripping out the oil level hole.
install the oil level and oil fill plugs.
Belt Tension
Belt tension should be checked on a cold belt
only.
1. Install the belt tension tool on the drive belt
and check the tension.
2. If adjustment is required, loosen the governor
adjusting bolts and move the governor until
the correct tension is obtained.
3. Remove the gauge. Tighten the governor ad-
justing bolts. Install the tension gauge and
recheck the belt tension
Throttle Control Rod
1. Manually move the governor throttle lever to
maximum open throttle with spring tension on
the governor.
2. Check the gap between the carburetor throttle
shaft lever and its maximum open position
stop. It should be 1132 to l/16 inch wide.
3. If adjustment is necessary, loosen the control
rod ball joint lock nuts, remove the rod from
the carburetor throttle lever and adjust the
length of the rod with the ball joints.
4.
Install the throttle control rod on the carburetor
throttle lever and recheck the gap. Tighten the
lock nuts.
RPM ADJUSTMENT
Attach a tachometer to the engine, then run the
engine until it reaches normal operating
temperature.
Disengage engine load and loosen the locknut
on the governor high speed stop screw. The loca-
tion of this screw will vary from governor to gover-
nor. Slowly pull the throttle to the desired
maximum engine speed and adjust the high speed
stop screw to maintain this speed.
The low speed adjustment is made with the low
speed adjustment screw, if the governor is so
equipped, or with the carburetor idle speed adjust-
ment screw.
Move the hand throttle or variable speed lever to
the closed position. Turn the adjustment screw in
or out until you can maintain the desired speed.
SPREAD ADJUSTMENT
Proper governor operation requires a difference
between full-load and no-load governed speed.
This is called spread or sensitivity. Too small an
RPM spread between the two speeds will cause
governor hunting and surging. Too large a spread
will cause low response to a load.
The normal RPM speed is 5 to 10 percent. This
means if the desired full-load RPM is 2000 RPM,
the no-load RPM can be 2100 to 2200 RPM.
The spread adjustment is the eyebolt type. Ad-
justment is made with the eyebolt that attaches the
spring to the variable speed lever.
To increase the spread, loosen the locknut and
turn the adjusting nut counterclockwise until the
engine speed decreases approximately 150 RPM;
then tighten the locknut.
To decrease the spread, loosen the locknut and
turn the adjusting nut clockwise until engine speed
increases approximately 150 RPM. Tighten the
locknut.
Recheck governor operation under full load and
no-load conditions.
NO-LOAD SURGE ADJUSTMENT
One other adjustment that you may need to
make is the no-load surge adjustment. It is set at
the factory and rarely requires changing. If neces-
sary, this adjustment can be used to prevent hunt-
ing and surging at no-load speeds, provided the
RPM spread adjustment is set properly.
To make the adjustment, increase the engine
speed with the hand throttle to 75 RPM lower than
the maximum no-load desired control RPM. Then
loosen the no-load surge adjustment screw lock-
nut and turn the screw inward untit RPM increases
to the desired control RPM.
CAUTION: Do not turn the screw in all the way.
It will interfere with proper governor operation
and prevent the governor from returning the
engine to idle speed.
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