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14-66
CARBURETOR-AFB
CHOKE VALVE
,HOKE
LEVER
WIDE OPEN
NCE
I
CHOKE
VALVE
CLOSED
-
7
Fig. 1 &Choke
Operating Link Clearances
some clearance should exist between the choke op-
erating link and the choke lever slot, in both the open
and closed choke valve positions, as should in (Fig.
16).
NOTE:
This clearance is necessary to allow the
choke valve to close for starting as well as fully
open after the engine reaches the normal operating
temperature.
If a clearance does not exist in both of these posi-
tions, a recheck of the operating link adjustment
should be made.
NOTE:
Free movement of the choke valve between
the closed and open positions i s very necessary.
This free movement should also exist between the
kick and the open choke valve positions with the en-
gine running. If binding does exist, the choke operat-
ing link has been improperly bent and should be cor-
rected.
Choke Un loader Ad just men
t
With the throttle valves in the wide open position,
it should be possible to insert Tool T109-80
(%
inch)
gauge between the upper edge of the choke valve and
the inner wall of the air horn, as shown in (Fig. 17).
If an adjustment is necessary, bend the unloader
lip on the throttle shaft lever, using Tool T109-41, un-
til correct opening has been obtained.
Accelerator Pump Adjustment
Move the choke valve to wide open position, to re-
lease the fast idle cam. Back off the idle speed adjust-
ing screw (curb idle) until the throttle valves are
seated in the bores.
Measure the distance from the top of the air horn
LIGHT C
DRILL
O R
GAUGE
PRESSURE
CHOKE
P
l l i
TANG
SHOULD
IDLE
CAM
I
I
THROTTLE IN WIDE
NK598
OPEN POSITION
Fig. 17-Measuring
Choke Unloader (wide open
Kick)
to the top of the plunger shaft, using a
"T"
scale,
as
shown in (Fig. 18). This distance should be
T I l 0
inch.
If an adjustment is necessary, bend the throttle
connector rod at the lower angle, using Tool T109-
213, until correct travel has been obtained.
Secondary Throttle Lever Adjustment
To check the secondary throttle lever adjustment,
block the choke valve in the wide open position and
invert the carburetor. Slowly open the primary throt-
tle valve until it is possible to measure
inch be-
tween the lower edge of the primary valve and the
bore (opposite idle port) as shown in (Fig. 19). At this
measurement, the secondary valves should just start
to open. If an adjustment is necessary, bend the sec-
)r,
, S CALE
Fig. 7 8-Measuring
the Accelerator Pump
Adjustment
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