Section 7
Choke, Shutdown Control and Governor
7-1. CHOKE TESTING AND ADJUSTMENTS (3.5kW,
4.5kW SINGLE)
A
WARNING
BACKFIRE! A sudden backfire can cause serious burns.
Keep hands and face away from the carburetor when the
air cleaner is removed.
7-1.1
General. When the engine start switch is activated,
battery current activates the rotary solenoid in the electric
choke unit (Figure 7-l). The choke lever pushes the choke
plate into the full choke position. The solenoid deenergizes
immediately after the switch is released from the start posi-
tion. When the solenoid deenergizes, the choke plate opens
to a position determined by a thermostatic spring and the
ambient temperature. As the engine warms and less choking
is needed, the thermistor circuit allows the choke plate to
gradually move to full open position.
A
WARNING
UNINTENTIONAL STARTING! To prevent accidental
starting when checking choke operation, remove spark
plug lead(s) at spark plug(s).
A
WARNING
FLASH FIRE! Asudden flash fire can cause serious burns.
To avoid the possibility of a flash fire, do not smoke or
permit flame or spark to occur near carburetor, fuel line,
fuel filter, fuel pump, or other potential sources of spilled
fuel or fuel vapors.
7-1.2. Inspection.
1. Disconnect the high tension lead from the spark plug
so the engine will not start.
2. Remove the air cleaner cover, element and base plate.
3. Push the start-stop switch on the controller to the start
position and hold for five seconds. The choke plate should
CHOKE
SHAFT
/
ONE LEAD TO
STARTER RELAY
THE OTHER LEAD
TO CONTROLLER
HEATER
(THERMISTOR)
TERMINAL
LOCKWASHER
IDLE FUEL
ADJUSTMENT
SOLENOID
TABS
AUTOMATIC
ELECTRI-CHOKE UNIT
I
LEVER
l/2 TURN TENSION
SPRING
Figure 7-1. Choke and Carburetor (3.5KW, 4.5KW)
7-l
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