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SECTION 6A
FUEL SYSTEMS AND GOVERNORS
Power Lead
Ground
=.
Solenoid =
Plunger
Shutdown
Control
Solenoid
Retaining
Bracket
Choke
Heater
Automatic
Choke
Figure 6A-23.
Engine Shutdown Control and Automatic Choke.
Automatic Choke Inspection
1. Disconnect the high tension leads from spark
plugs so the engine will not start.
2. Remove the air cleaner cover, element and base.
3. Tum the start switch to the start position and hold
for five seconds.
The choke should fully close
and release when the start switch is released.
4. If he choke does not function properly (Step 3)
see Service Guide on previous page.
Automatic Choke Service
Choke Unit Replacement (see Flgure 6A-23)
1. Position the choke unit on the two mounting
screws so that it is slightly loose.
2. Rotate the choke unit clockwise on the carburetor
(viewed from the choke side) with a slight pres-
sure until the choke valve is positioned 4 to 6 de-
grees towards the closed position.
3. While holding the choke unit in the above posi-
tion, tighten the two mounting screws.
4. This adjustment must be accomplished at an am-
bient temperature of 70-75°F.
Shutdown Control Function
The engine shutdown control device is a solenoid and
plunger mounted on the carburetor which prevents the
engine from "running on" after the ignition is turned off.
See Figure 6A-23.
When the switch is in the start po-
sition, battery current thru the solenoid holds the
plunger and continues to hold it while the engine is
running. When the switch is moved to the stop posi-
tion the solenoid de-energizes and drops the plunger
into a porting in the carburetor to stop all flow of fuel,
The engine shutdown control has two lead wires on
it--a ground lead from the top of the shutdown sole-
noid and a power lead from the bottom of the sole-
noid. The power lead is wired into the (4-) side of the
rectitier-regulator.
Shutdown Control Inspection
1. Make sure the solenoid has a secure electrical
connection and good contact with the retaining
bracket (ground).
2. Check for stuck plunger. Replace if damaged.
3. Check tor defective solenoid with an ohmmeter or
multimeter. Solenoid resistance is approximately
20 ohms.
Shutdown Control Test
Refer to Figure 6A-23 for identification of parts.
1. Remove shutdown control (solenoid and plunger)
from carburetor body by loosening the screw so
the retaining bracket holding the control can be
shifted. Do not disconnect the lead wires.
2. Pull the shutdown control out of the carburetor.
3. Hold the plunger approximately 1/4" away from
the ѕо!епоіа.
Turn the ignition switch to "ON" and
reiease the plunger.
6A.17
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