Kohler COMMAND CV17-745 Service Manual page 51

Kohler Engine Parts Call K&T 606-678-9623 or 606-561-4983
9. Install the new return spring onto the new choke
shaft, so the upper leg of the spring is between
the two formed "stops" on the end of the choke
shaft. See Figure 5-35. Note: Make sure it stays in
this location during the following step.
Figure 5-35. Choke Shaft and Spring Details.
11. Slide the choke shaft and spring, into the
carburetor. Pivot (preload) the shaft and set the
inner leg of the spring, against the formed stop
within the choke lever as originally assembled.
See Figure 5-35. The opposing leg of the spring
must still be between the formed "stops" of the
choke shaft.
12. Place a drop of the Loctite
each new screw. Install the new choke plate to the
flat side of the choke shaft and start the two
screws. The larger cutout must be on the right.
Close the choke and check the plate alignment
within the carburetor throat, then tighten the
screws securely. Do not overtighten.
13. Check for proper operation and free movement of
the parts. Install the new cap.
Always use new gaskets when servicing or reinstalling
carburetors. Repair kits are available which include
new gaskets and other components. Service/repair kits
available for Keihin carburetors and affiliated
components are:
Carburetor Repair Kit
Float Kit
Solenoid Assembly Kit
Accelerator Pump Kit
Choke Repair Kit
High Altitude Kit (1525-3048 m/5,000-10,000 ft.)
High Altitude Kit (Over 3048 m/10,000 ft.)
®
on the threads of
www.mymowerparts.com
Fuel System and Governor
Governor
General
The engine is equipped with a centrifugal flyweight
mechanical governor. It is designed to hold the engine
speed constant under changing load conditions. The
governor gear/flyweight mechanism is mounted inside
the crankcase on the oil pan, and is driven off the gear
on the camshaft. The governor works as follows:
• Centrifugal force acting on the rotating governor
gear assembly causes the flyweights to move
outward as speed increases. Governor spring
tension moves them inward as speed decreases.
• As the flyweights move outward, they cause the
regulating pin to move outward.
• The regulating pin contacts the tab on the cross
shaft causing the shaft to rotate. One end of the
cross shaft protrudes through the crankcase. The
rotating action of the cross shaft is transmitted to
the throttle lever of the carburetor through the
external linkage. See Figure 5-36.
• When the engine is at rest, and the throttle is in
the "fast" position, the tension of the governor
spring holds the throttle plate open. When the
engine is operating, the governor gear assembly
is rotating. The force applied by the regulating pin
against the cross shaft tends to close the throttle
plate. The governor spring tension and the force
applied by the regulating pin balance each other
during operation, to maintain engine speed.
• When load is applied and the engine speed and
governor gear speed decreases, the governor
spring tension moves the governor lever to open
the throttle plate wider. This allows more fuel into
the engine, increasing engine speed. As speed
reaches the governed setting, the governor spring
tension and the force applied by the regulating pin
will again offset each other to hold a steady
engine speed.
Section 5
5.17