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14-16
CARBURETOR-BBS
7
,STEP-UP
PISTON
STEP-UP WIRE
F CYLINDER)
N K643
Fig. &Removing
or Installing Step-up Piston
again, or if a new plunger is to be installed, place the
plunger in a jar of clean gasoline or kerosene to pre-
vent the leather from drying out.
(9) Lift out the float fulcrum pin retainer, then lift
out the floats and fulcrum pin.
(10) Remove the fuel inlet needle valve, seat and
gasket from the main body.
(11) Remove the step-up piston retaining screw,
and slide step-up piston and rod out of well, as shown
in (Fig. 4). Now lift out the step-up piston spring.
Remove the step-up piston gasket from the bottom
of the well.
(12) Remove the main metering jet and gasket, as
shown in (Fig. 5).
(13) Unscrew and remove the idle orifice tube, as
shown in (Fig. 6).
(14) Invert the carburetor and drop out the accel-
erator pump check balls from their respective seats.
(15) Using Tool T109-43 plug remover, remove the
accelerator pump jet plug. Using Tool T109-59T, re-
move the accelerator pump jet, as shown in (Fig.
7).
(16) Unscrew and remove the idle mixture adjust-
Fig. 5-Removing
or
Installing M a i n Metering Jet
JET
I44
Fig. &Removing
or Installing Idle Orifice l u b e
ing screw and spring.
The carburetor now has been disassembled into
three main units, namely, the air horn, main body
and throttle body and the component parts of each
disassembled as far as necessary for cleaning and in-
spection.
It is usually not advisable to remove the throttle
shaft or valve from the throttle body, unless wear or
damage necessitates the installation of new parts.
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 assembly be replaced
rather than installing a new shaft in the old body.
ACCELERATOR PUMP INLET CHECK BALL
LBOllOM
O F
PUMP CYLINDER)
LE AIR BLEED ORIFICE
\-
A
ACCELERATOR PUMP JET
,
NK646
Fig. 7-Removing
or Installing Accelerator
Pump Jet
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