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14-54
CARBURETOR-WWC3
CAUTION: Do not attempt to change the setting
without removing the float,
as
the synthetic rubber
tip can be compressed sufficiently to cause a false
setting, which will affect correct level of fuel in the
bowl.
NOTE: It is important that the float lip is perpen-
dicular to the needle or slanted not more than
10
degrees away from the needle when the float is
set correctly.
Do not bend float lip by forcing float,
use Tool
73605.
(3)
Install the float, then slide the float baffle
down into position. Install the fulcrum pin spring.
Assembling the Air Horn
To assemble the air horn, refer to (Fig. 16), then
proceed as follows:
(1) Slide the choke shaft and lever into the air horn
with the choke lever pointing down and away from air
horn. Slide the choke valve down into the slot in shaft.
(2)
Hold the choke valve closed, and install new
screws.
DO NOT TIGHTEN.
Holding the valve in the
closed position, tap gently with a screwdriver, to cen-
ter and locate the valve.
(3) Tighten attaching screws securely, then stake by
squeezing with pliers. Reinstall the fast idle lever and
secure with lockwasher and nut.
(4)
Remove the accelerator pump plunger from the
jar of gasoline. Check the leather. If the leather is
hard, cracked, or worn, install a new pump plunger.
(Be sure to flex the leather several times before in-
stalling plunger in air horn.)
(5)
Slide the compression spring over plunger shaft,
then slide plunger over hook and into position. Refer
to (Fig. 4 ) .
(6) Install a new air horn gasket, then install the
vacuum power piston in air horn. Lock in position by
prick punching on the air horn rim. Compress the pis-
ton plunger to be sure no binding exists. If the piston
sticks or binds enough to hinder smooth operation,
install a new piston assembly.
(7)
Install the air horn assembly on the main body,
guiding the pump plunger into its well. (Be sure the
leather does not curl or fold back.) Install retaining
screws and tighten securely. Refer to (Fig.
2).
The
choke valve must be held partially closed while install-
ing the air horn.
(8)
Remove the two short screws holding the main
body and throttle body together, refer to (Fig. 3), and
install the air horn. Reinstall the two long screws and
tighten securely.
(9)
Install the fast idle rod and secure with hairpin
clip.
(10) Install the pump rod and secure with hairpin
clip. (Be sure rod is in the center slot of arm, refer
to (Fig.
1).
Work the accelerator pump plunger sev-
eral times, to be sure it operates smoothly.
Choke Vacuum Diaphragm
Inspect the diaphragm vacuum fitting
to
be
sure
that
the passage is not plugged with foreign material. Leak
check the diaphragm to determine if it has internal
leaks. To do this, first depress the stem, then place a
finger over the fitting to seal the opening. Release the
stem. If the stem moves more than
inch in
10
seconds, the leakage is excessive and the assembly
must be replaced.
(1)
Install the diaphragm assembly on the air horn
and tighten the attaching screws securely.
(2)
Install the choke operating link in position be-
tween the diaphragm plunger (stem) and the choke le-
ver. Install clip to secure.
Be sure the link is on the
proper side of the wire spring. See (Fig.
1).
(3)
Inspect the rubber hose for cracks before plac-
ing it on the correct carburetor fitting. Refer to (Fig.
2). Do not connect the vacuum hose to the diaphragm
fitting until after the vacuum kick adjustment has
been made. (See Carburetor Adjustments.)
ADJUSTMENTS
It is very important that the following adjustments
be made on a reconditioned carburetor and in the se-
quence listed, namely:
Fast Idle Cam Position Setting
Vacuum Kick Adjustment
Unloader Adjustment (wide open kick)
Accelerator Pump Travel
Bowl Vent Valve Setting
Fast Idle Speed and Cam Position
Adjustment
The fast idle engine speed adjustment should be
~~
J
6
NK43
OF HIGHESTCAM STEP
Fig. 17-Fast
Idle Cam Position Adjustment
-~
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