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5.10
Section 5
Fuel System and Governor
Overhaul Kit Contains: Reassembly Procedure
Reassembly is essentially the reverse of the
disassembly procedure. Use new gaskets, springs,
and adjusting screws as provided in the repair kit. Also
use new carburetor and intake manifold gaskets.
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 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 5-7.
• 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 arm 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.
Qty.
Gasket, air cleaner base
Gasket, carburetor
Screw, throttle adjusting
Gasket, chamber screw
Screw, idle adjusting
Float
Pin, float
Inlet Needle
Gasket, float chamber
Spring, throttle adjusting screw
Spring, idle adjusting screw
Gasket, passage cover
Description
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Gasket Kit Contains:
Description
Gasket, air cleaner base
Gasket, carburetor
Gasket, chamber screw
Gasket, float chamber
Gasket, passage cover
Solenoid Replacement Kit Contains:
Qty.
Description
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Gasket, air cleaner base
Gasket, carburetor
Gasket, solenoid
Gasket, chamber screw
Holder, solenoid
Valve, solenoid
Qty.
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Qty.
Gasket, air cleaner base
Gasket, carburetor
Screw, valve set
Valve, choke
Filter, choke shaft
Spring, choke arm return
Ring, choke lever
Collar, choke
Shaft, choke assembly
Lever, choke assembly
Choke Repair Kit Contains:
Description
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