As always, keep in mind these are general instructions and every detail may not pertain to your specific carburetor.

Take lots of pictures as you disassemble so you have something to reference later.

DISASSEMBLY

  1. With carburetor removed from vehicle, remove altitude compensator (if equipped), idle enrichment diaphragm, vacuum nipple and diaphragm return spring. Remove accelerator pump rod connectors and remove pump rod. Remove accelerator lever pump arm screw and disengage from pump rod “S” link.
  2. Remove rod retainers and washer holding choke diaphragm connector rod to choke vacuum diaphragm and air valve lever, then remove lever. Remove rod retainer holding choke connector to choke countershaft.
  3. Remove step-up piston cover plate attaching screw and cover plate, then remove step-up piston and link assembly with step-up rods. Remove step-up piston spring. Remove pump jet housing screw, housing with gasket, and then invert carburetor and remove discharge check needle. Remove (10) screws, two of the bowl cover screws are located between choke valve and wall of bowl cover, remove bowl cover and invert on bench to protect floats.

BOWL COVER

  1. Remove float lever pins and lift out float assemblies, mark float removed from pump side so that floats may be reinstalled in their respective positions. Remove two needle valves from their locations, mark needle valve removed from pump side to aid in reassembly, then using a wide blade screwdriver, remove needle valve seats. Be sure each needle valve is returned to its original seat at reassembly.
  2. Remove secondary jets (small screwdriver slots). Remove accelerator pump passage tube (plastic) and bowl cover gasket. Remove accelerator pump rod “S” link. Using a small rod placed on upper end of plunger shaft, tap lightly with a small hammer to remove plunger shaft. CAUTION: Use care not to damage plunger shaft hole in bowl cover, place fingers under lower portion of pump cylinder in order to catch intake check seat, disc, disc retainer and springs.
  3. Note position of bowl vent connector rod and arm spring before removing retainer clip from connector rod, then remove rod from bowl vent operating arm. Remove grommet seal from operating arm, then remove inlet fitting and gasket.

THROTTLE BODY

  1. Remove step-up actuating lever. Remove choke diaphragm and bracket assembly (with hose), and place aside for special cleaning. NOTE: Carburetor vacuum fitting hides a very small vacuum passage restriction, clean passage only with compressed air.
  2. Remove plastic limiter caps from idle mixture screws, being sure to count the number of turns to seat screws (from stop), as the same number of turns must be maintained at reassembly. Remove idle mixture screws and springs. NOTE: It is not recommended that throttle shafts or valves be removed unless wear or damage necessitates the installation of new parts.

MAIN BODY

  1. Remove and discard primary “O” ring seals. Remove primary metering jets. It is not necessary to remove baffle plate from main body. NOTE: Do not leave main body in cleaning solvents for prolonged periods of time.

REASSEMBLY

Reverse disassembly procedures and note the following:

VALVE INSTALLATION: Slide throttle valves into position on throttle shaft with the valve number on the bottom (flange side) and opposite the vacuum port. Install new screws, but do not tighten. Be sure idle speed adjusting screw is backed out. Hold valves in place with fingers (hold high side of valves), then tap valves lightly with screwdriver, tighten screws securely and stake screws, being sure to support shaft when staking.

IDLE MIXTURE SCREWS & LIMITER CAPS: Install idle mixture screws and springs, tapered portion must be straight and smooth; if tapered portion is grooved or ridged, a new screw must be installed. Do not use a screwdriver when installing, turn screws lightly against their seats with fingers, then back off the same number of turns counted at disassembly. Do not reinstall limiter caps.