Figure following name of part indicates quantity necessary for one complete assembly.

Figure following name of part indicates quantity necessary for one complete assembly.

Remove float valve seat (7) and gasket (8). Turn out float lever pin (9) and slip float (10), float lever (11) and float valve (12) out of bowl.

Loosen throttle stop lock screw (13) and slip throttle lever (14) off throttle shaft with throttle lever arm (15) and throttle shaft spring (16).

rtemove throttle shaft screws (17), slip throttle disc (18) out of slot in throttle shaft and pull out throttle shaft (19).

Remove low speed needle valve (20) and high speed needle valve (21).

Remove needle valve lever screw (22), needle valve lever (23), lever spring (24) and lever spring collar (25).

Remove air intake shaft nut and washer (26), air intake shaft stop (27), friction ball (28) and friction spring (29).

Remove air intake disc screws (30), air intake disc (31) and pull out air intake shaft (32).

Remove idle hole body plug (33) two idle passage plug screws (34) and carburetor fixed jet (35).


Place all parts except gaskets and float in "Gunk Hydro-Seal" or other carbon and gum dissolving agent. Wash, and dry all parts with compressed air. Blow air through all carburetor barrel passages as shown in Fig. 3F-9B. Never scrape carbon deposits from carburetor barrel or other parts with knife or other steel instrument.

Check throttle shaft fit in throttle shaft bushings (36). If excess play exists, use an appropriate size drift pin to remove old bushings. Press in replacement parts and line ream with a .250 in. drill.

Examine carburetor venturi (37). If it is extremely loose or pitted, slip out and replace.

Check float valve and float valve seat seal as follows:

Assemble parts 12 through 7 to carburetor bowl (5). Hold bowl upside down so float, valve closes. Suck on bottom of float valve seat. If valve leaks, replace valve and seat.

If float is damaged or logged, replace with new part. Cut cement seal around float screw which secures float to float lever. Remove float screw and assemble new float to lever but leave screw loose. Position bowl so it is upright (the way it fits on carburetor barrel) with gasoline inlet on far side. Pull float toward you to the limit of the slot in float lever and about 1/16 in. to left of center line (see Fig. 3F-9C). This provides clearance in float bowl. Tighten float screw and cement float screw to float with any cement that is impervious to gasoline, or thick shellac.

Check float lever as follows:

Turn assembled float bowl upside down. Measure distance from lip of float bowl to top of float directly opposite float lever. This distance should be exactly 1/4 in. When adjusting carburetor float, do not bend float lever while installed in bowl. Adjusting in this manner bends and spreads fingers between which head of float needle fits and develops lash or lost motion between float and needle. Float and lever assembly should be removed from bowl, and lever then bent as required.

Check needle head fit in float lever. It should be a free fit to about .003 in. clearance. To check clearance with float assembled, hold needle against seat with small screwdriver without restricting float lever. Move float up and down and observe free play between needle head and float lever (see Fig. 3F-9C).

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