Changing The High Speed (Rpm) On The Engines With Separate Controls (Increase Or Decrease Rpm); Governed Idle Adjustment; Location Of Governed Idle Adjusting Screw; Governor Gear/Flyweight Assembly - Kohler Courage SV470-600 Service Manual

Changing the High Speed (RPM) on the Engines
with Separate Controls (Increase or Decrease
RPM)
1. Check that the governor spring and installation
matches the intended high speed RPM operating
range. Refer to Figure 5-23.
2. Start the engine, move the application throttle
lever to full throttle/fast, and loosen the mounting
screws of the main speed control bracket to allow
repositioning. See Figure 5-17.
3. To increase the RPM: Move the speed control
bracket, towards the carburetor. To decrease the
RPM: Move the speed control bracket, away from
the carburetor. Check the RPM with a tachometer
and tighten screws when correct setting has been
obtained.
4. To ensure that the RPM has been obtained, move
the throttle lever to low idle/slow then back to full
throttle/fast position and check the RPM with a
tachometer.
Setting the Low Idle RPM
1. Move the application control to slow position.
2. Using a tachometer, check the RPM. Then, using
a screwdriver, turn the low idle speed screw (see
Figure 5-3) inward (clockwise) to increase the
RPM, and outward (counterclockwise) to lower
the RPM.

Governed Idle Adjustment

An optional governed idle control system is supplied
on some engines. The purpose of this system is to
maintain a desired idle speed regardless of ambient
conditions (temperature, parasitic load, etc.) that may
change.
The system requires an additional procedure for
setting the idle speed. If speed adjustments are
required proceed as follows.
1. Make any necessary speed or control
adjustments following the appropriate instructions
already covered in this section.
2. Move the throttle control to the idle position. Hold
the governor lever away from the carburetor, so
the throttle lever is tight against the idle speed
adjusting screw. Check the speed with a
tachometer and adjust it to 1500-1750 RPM.
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3. Release the governor lever and allow the engine
to return to the governed idle speed. Check it with
a tachometer against the equipment
manufacturers recommended idle speed. If
adjustment is necessary, use the governed idle
adjusting screw on the speed control assembly
(see Figure 5-19). Turn the screw clockwise to
increase the governed idle speed and
counterclockwise to decrease it.
Figure 5-19. Location of Governed Idle Adjusting
Screw.
Governor
These engines are equipped with a centrifugal
flyweight mechanical governor, designed to hold the
engine speed constant under changing load
conditions. The governor gear/flyweight mechanism is
mounted on the closure plate in the crankcase, and is
driven off a gear on the crankshaft. See Figure 5-20.
Figure 5-20. Governor Gear/Flyweight Assembly.
Not For Resale
Fuel System and Governor
Governed Idle
Adjusting Screw
Section 5
5
5.13