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9-5-2 DISASSEMBLY AND ASSEMBLY OF CARBURETOR
The most common trouble with the carburetor, apart from mechanical ones, is failure to provide
the correct air-fuel mixture.
This is generally caused by blockage in the air and fuel channels or
fuel level fluctuation. In order to maintain the carburetor in a normal operating condition, it is
vital to keep the air and fuel channels always clean so that the fuel flows normally.
Disassembling and assembling procedures are as shown below (Refer to Fig. 9-5-2).
(1) Throttle System
@ Remove the cross-screw (31), the throttle valve (26), and then pull out the throttle shaft
(27).
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When the throttle stop screw (29) is removed, the spring (28) will also come off. Be
careful when handling the throttle valve not to damage the valve edge.
(2) Choke System
@) Remove the. cross screw (20), and the choke valve (21), and then pull out the choke shaft
(22).
@ When installing the choke shaft be sure to keep the notch of the choke valve in the main
air jet side.
(3) Pilot System
@ Remove the pilot jet (30). When removing it, use a proper tool so that the nozzle will not
be damaged.
@ Firmly fix the pilot jet when assembling the carburetor. Otherwise fuel leakage will
occur resulting in engine trouble.
(4) Main System
@ Remove the bolt (18) and the float chamber body (16).
@ Remove the main jet (19) from the body (12).
@ When assembling, firmly fix the main jet. Otherwise the air-fuel mixture will become too
rich, causing engine troubles.
@ Torque for the bolt (18) is 70 kg-cm.
(5) Float System
@ Pull out the float pin (15), and then remove the float (14) and the needle valve (23). When
replacing the needle valve, exchange it with a rubber needle.
* Don’t use a wire or a drill to clean the fuel passages (they may damage the orifice
controlling the fuel flow). Use compressed air.
* The float pin is peensecured to the carburetor body; the needle valve can be removed from
the opposite side of the peen-secured part by slightly striking the float with a thin bar-like
object.
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