AMBIENT
TEMP.
(OF)
CHOKE
OPENING
(Inches)
OPEN
I
NG
TEXT)
60 65
70
75
80
85
90 95
100
1/8
9/64.
5/32
11/64 3/16 13/64
7/32
15/64
1/4
CHOKE
864
.
LOOSEN THIS
SCREW
AND
ROTATE THE
G2
-
ENTIRE COVER
-G
ASSEMBLY
FIGURE
Sa.
THERMAL MAGNETIC CHOKE SEiTlNGS
Check the choke and throttleshaftsforexcessiveside
play and replace if necessary.
THERMAL MAGNETIC CHOKE
This choke uses a heating element and
a
heat
sensitive bimetal spring to open the choke. The choke
solenoid, actuated during engine cranking only,
closes the choke according to ambient temperature,
Figure 6a.
If adjustment is required, use the following instruc-
tions. Choke bimetal spring must be at ambient
temperature. Allow engine to cool at least one hour
before setting. Adjust choke by turning the choke
body, which engages a link connected to a bimetal
choke spring.
Remove air cleaner and adapter to expose the
carburetor throat. Loosen the screw which secures
the choke body. Rotate choke body clockwise to
increase choke and counterclockwise to decrease
choke action (leaner mixture). Refer to Figure 6a for
correct choke setting according to ambient tempera-
ture. Use drill rod or shank of drill bit to measure
choke opening.
Disassembly and Repair:
If
choke will not heat prop-
erly, check for broken heater wire, high-resistance
connections, or broken lead wires to the bimetal and
heater assembly. With the element at room tempera-
ture, check the heater resistance with an ohmmeter.
The resistance should be about
30.6
to
37.4
ohms for
a
12
volt system. If the heater
is
defective, replace it
with a new one. When the start button
is
engaged, the
solenoid should cause thespring-loaded armature to
contact the solenoid core.
.
x
518
O.D.
x
VJ6")
CHOKE PLATE
SOLENOID 'COIL
RETAINING RIN
SOLENOID CORE
BIMETAL AND
HEATER
ASSY
GROUND
TERMINAL
GROUND LEAD
SHAKEPROOF WASHER
-WASHER
(24/64
ID.
x
9/16
O.D.
x
1/16")
THERMO-MAGNETIC
CHOKE NUT
(5/16-
18")
>
A076
FIGURE
6b.
THERMAL MAGNETIC CHOKE ASSEMBLY
12
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Redistribution or publication of this document
by any means, is strictly prohibited.
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