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CARBURETOR-WW3
14-47
c
BEND TANG
0
:
T H R O T T L ~
LEVER TO ADJUST
OPENING^
I&
I
HELD
IN
SITION
NK452
Fig. 21-Unloader
Adjustment (wide open kickj
tween the choke valve and wall of air horn, as shown
in (Fig. 21).
(2) To adjust, bend the tang on the throttle lever
using Tool T109-214, as shown in (Fig. 21).
(3) Hold choke open and then open and close the
throttle valves. Failure to obtain full throttle oper-
ation indicates improper assembly of the choke mech-
anism.
(4) With the throttle valves held in open position,
open the choke valve slowly to wide open position.
There should be no bind throughout the entire travel
of choke mechanism.
CHOKE VALVE
I
WIDE OPEN
Fig. 22-Measuring
Bowl Vent Valve Opening
ACCELERATOR PUMP ROD
b
,(BEND AS REQUIRED AT
Fig. 23-Bending
Accelerator Pump Rod
Accelerator Pump and Bowl Vent
Adjustment
When assembling the accelerator pump to the air
horn, note that the horseshoe clip (which opens the
bowl vent) can be placed in any one of the three posi-
tioning notches. These notches correspond to the long,
medium and short pump stroke holes in the throttle
lever. Normally, the bowl vent clip on the pump
stem will be at the middle notch and the pump rod
in the medium stroke hole.
The proper procedure is to adjust the amount of
bowl vent opening instead of measuring and set-
ting the height of the pump plunger.
To check or set the adjustment, proceed as follows:
(1)
Back off idle speed adjusting screw. Open the
choke valve, so that when the throttle valves are
closed, the fast idle adjusting screw will not contact
the fast idle cam.
(2) Be sure the pump rod is in the medium stroke
hole in the throttle lever, and that the bowl vent clip
on the pump stem is in the center notch.
(3) Close the throttle valves tightly. It should be
just possible to insert a
5/Is4
inch drill between the bowl
vent and the vent seat protruding through the air
horn,
as
shown in (Fig.
22).
If an adjustment is necessary, bend the pump rod,
using Tool T109-213 at the lower angle, until the cor-
rect bowl vent opening has been obtained, as shown
in (Fig. 23).
This is an important adjustment, since too much
lift at the bowl vent will result in considerable loss in
low speed fuel economy.
Remember that
if
the pump rod is moved to either
the short or long stroke position, a corresponding
change must be made in the location of the bowl vent
clip, and the amount of the lift of the bowl vent re-
checked and adjusted.
NOTE:
The accelerator pump travel is automatical-
ly taken care of when the bowl vent
is
properly
adjusted.
Idle Speed Adjustment fCurb
Idle)
To make the idle speed adjustment, the engine
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