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14-44
CARBURETOR-WW3
en
securely.
(If
the needle
is
ridged or badly
worn,
install a new needle valve and seat assembly.)
(8)
Install the float fulcrum pin retaining spring in
position and force under lip of boss to keep fulcrum
pin in position.
Measuring the Flout Height
The carburetors are equipped with a synthetic rub-
ber tipped fuel inlet needle. The needle tip is a rubber
material which is not affected by gasoline and is sta-
ble over a wide range of temperatures. The tip is
flexible enough to make a good seal on the needle
seat, and to give increased resistance to flooding.
The use of the new inlet needle requires a new pro-
cedure in adjusting the float setting. Care should be
taken to perform this operation accurately in order to
secure the best performance and fuel economy.
To correctly set the float height when the carbu-
retor is being overhauled proceed as follows:
(1)
Install the float with the fulcrum pin and retain-
ing spring in the main body.
(2) Install the needle, seat and gasket in the body
and tighten securely.
(3) Invert the main body
so
that the weight of the
float
only
is forcing the needle against the seat.
(4)
Using Tool 73725 or a "T" scale, check the float,
as shown in (Fig.
14).
There should be
7/32
inch from
the surface of the fuel bowl (gasket removed) to the
top of the float at the center.
If an adjustment is necessary, hold the float on the
bottom of the bowl, then bend the float lip toward or
away from the needle, using Tool 73605. Recheck the
i/32
inch setting again then repeat the lip bending
operation
as
required.
CAUTION:
When bending the float lip, do not al-
low the lip to push against the needle as the syn-
thetic rubber tip can be compressed sufficiently to
cause a false setting which will affect correct level
of fuel in the
bowl.
NK446
Fig. 14-Measuring
the Float Setting
Fig. IS-Bending
Float Lip
After being compressed, the tip is very slow to re-
cover its original shape.
It is very important that the float lip
ba
perpondicu-
lar to the needle or slant 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,
as shown in (Fig. 15).
(5) To change the float setting, bend the float lip
toward the needle to lower, and away from needle
to
raise the float.
Install the idle tubes in the main body. See (Fig. 3).
These tubes are interchangeable.
Assembling
Air
Horn
To reassemble the air horn, refer to (Fig. l), then
proceed as follows:
(1) Remove the accelerator pump plunger from the
jar of gasoline. If the leather is hard, cracked or
worn, install a new plunger and shaft.
(2) Slide the compression spring over the plunger
shaft. Insert the assembly through the air horn.
(3) Slide bowl vent valve over shaft and down
STAKE IN POSITION
AFTER INSCALLING
AND SI
P
'
- I
NK447
Fig. 1 6 - l n s t a l l i n g Vacuum Power Piston
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