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CARBURETOR-W
WC3
1 4-5 1
Fig. 7-Removing
or Installing the Power By-Pass Jet
(4)
Invert the carburetor main body and drop out
the discharge check ball from the discharge passage,
refer to (Fig. 6), and the accelerator pump inlet check
ball from the pump well.
(5)
Using T109-73S, remove the power by-pass jet
and gasket, as shown in (Fig. 7).
(6) Using Tool T109-173, remove the two main me-
tering jets, as shown in (Figs. 7 or
8).
(7) Remove the two air horn screws, used to hold
the main and throttle bodies together. Separate the
throttle and main bodies, and discard the gasket.
Throttle Body
(1) Unscrew and remove the two idle mixture ad-
justing screws and springs from the throttle body.
(2)
The carburetor now has been disassembled into
three units, namely, the air horn, main body and
throttle body and the component parts of each dis-
assembled as far as necessary for cleaning and in-
spection.
It is usually not advisable to remove the throttle
shaft or valves unless wear or damage necessitates in-
stallation of new parts. To install new valves or throt-
POWER BY-PASS
JET GASKET
POWER
BY-PASS
JET
NK424
Fig. 9-Ports
in
Relation
to
Throttle Valves
tle shaft, refer to Inspection and Reassembly para-
graph.
There is about
.005
inch clearance between the
throttle shaft and the throttle shaft bores in the throt-
tle body. Any clearance over .010 inch is excessive
and a new throttle shaft and/or throttle body should
be installed.
INSPECTION AND ASSEMBLY
Throttle Body
(1) Check the throttle shaft for excessive wear in
the throttle body. If wear is extreme,
it
is recom-
mended that the throttle body be replaced, rather than
installing a new throttle shaft in the old body.
During manufacture, the location of the idle trans-
fer ports and the spark advance control ports to the
valves are carefully established for one particular as-
THROllLE VALVES
Fig. 8-Removing
or Installing the M a i n Metering
Jets
Fig. 1 L T h r o t t l e Body (Exploded V i e w )
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