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41. CARBURETOR
A. Description
Air flow through the venturi is controlled by
a throttle slide (vacuum piston). The slide is
raised and lowered by engine vacuum rather
than a cable linked directly to the throttle
grip.
B. Specifications
Main jet
Jet needle
5 0 2 - 3
Needle jet
z - 2
Starter jet
Fuel valve seat
2 m m
Pilot jet
Fuel level
NOTE:
The low speed mixture screw settings are
adjusted at the factory with the use of special-
ized equipment. Do not attempt to change
these settings.
C. Disassembly
1.
Prepare to separate carburetors (separa-
tion not necessary if only float level
adjustment or throttle value inspection is
to be done). Remove starter lever. Loosen
starter lever securing screws and remove
starter lever rod.
2.
Remove upper and lower brackets. Note
position of synchronizing screws for
guidance in reassembly. Separate car-
buretors.
3.
Remove vacuum chamber cover. Remove
the spring, needle fitting clip, needle,
and diaphragm (piston valve).
4.
Note that there is tab on the rubber
diaphragm. There are matching recesses
in the carburetor body for the diaphragm
tab.
5.
6.
(above gasket surface)
8.
To inspect starter jet, remove three (3)
screws holding the starter body to the right
side of the carburetor.
Remove the four screws holding the float
bowl cover. Remove float bowl cover. The
main jet is located under a cover in the
float bowl.
Pull out float pivot pin. Remove the float
7.
assembly. Be careful not to lose the float
valve needle located under the float level
adjustment tongue. Remove the needle
jet.
Reassemble in reverse order. Pay close
attention to the installation of the
vacuum piston diaphragm.
D. Inspection
1.
Examine carburetor body and fuel passage-
s. If contaminated, wash carburetor in
petroleum-based solvent. Do not use
caustic carburetor cleaning solutions.
Blow out all passages and jets with com-
pressed air.
Examine condition of floats. If floats are
2.
leaking or damaged, they should be re-
placed.
Inspect inlet needle valve and seat for
3.
wear or contamination. Replace these
components as a set.
Inspect piston valve and rubber dia-
4.
phragm. If the piston is scratched or the
diaphragm is torn, the assembly must be
replaced.
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