ELECTRIC CHOKE
The choke consists of a bi-metal coil and an electric
heating element. The bi-metal coil connects to the
choke shaft and holds the choke plate nearly closed
when the engine is cold.
As
the engine starts, current is supplied to theelectric
heating element in the choke cover. Heat from the
element causes the bi-metal coil to twist. The twisting
action of the coil turns the choke valve shaft and
gradually opens the valve. Heat from the element
keeps the choke open while the engine is running.
The choke cover gefs very hot dur-
ing normal operation and can cause
serious
burns
if
touched.
Do
nof
touch the choke
cover while the set is operating.
~
AVERAGE
CHOKE
SETTING
Ambient Temp
Choke
Opening
58'
(14OC)
closed
66'
(19OC) 114
open
72' (22OC)
1
I2
open
76'
(24OC) 314
open
82' (28OC)
open
If the engine starts but runs roughly and blows out
black smoke after a minute or two of operation, the
choke is set too rich. If the engine starts but sputters
or stops before it warms up, the choke is set too lean.
Adjustment
Table
2
lists average choke settings. Loosen the
two
mounting screws and rotate the choke cover until the
correct setting
is
attained. Check the setting by starting
the engine and observing its operation. Be sure to
retighten the mounting screws after adjustment
(Figure
24).
TABLE
2.
CHOKE SPECIFICATIONS
BI-METAL COIL
n
CATCH OUTER END
OF
COIL
IN
SLOT
IN
COVER TAB
COVER
MOUNTING
SCREWS
FS
1484
LOOSEN THESE
RICHER
MIXTURE
FIGURE
24.
ELECTRIC
CHOKE
ADJUSTMENT
Repair
If the choke fails to operate, check to see if the heat-
ing element isworking. If it is, thechokecovershould
become hot after afew minutes of engine operation.
If the cover does not get hot, check for current at the
cover terminal. The engine must be running. Trace
down any opens or shorts.
Remove the choke cover to inspect
the
heating ele-
ment and coil. See that the element is not burned out
or broken. The bi-metal coil must not be damaged,
dragging in the housing, or have an improperly
directed spiral.
When installing a new coil, maintain the original
direction of spiral inward from the fastening screw.
Be sure the coil sets squarely in the housing
so
it will
not bind.
Coil
should not touch inside of choke body.
24
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