INITIAL CHOKE VALVE PULLDOWN ADJUSTMENT

  1. Remove choke coil housing assembly.
  2. Open throttle about half way.
  3. Place fast idle screw on HIGH step of fast idle cam.
  4. Bend a .036” diameter wire gauge at a 90* angle about 1/8” from its end.
  5. Insert bent end of gauge between choke piston slot and upper edge of right hand slot in choke housing.
  6. Turn choke lever COUNTER-CLOCKWISE until gauge is held snugly in piston slot. Hold lever lightly to maintain gauge position.
  7. Move top of choke rod away from carburetor and move bottom of choke rod towards carburetor to remove slack from linkage.
  8. Insert gauge of proper size between lower edge of choke valve and air horn wall (at center of carburetor).
  9. Adjust by turning hex head lock screw on choke valve shaft CLOCKWISE THREE TURNS.

CAUTION: Lock screw has left hand threads

  1. Pry choke lever form shaft to loosen.

  2. Check that choke lever rotates freely on shaft.

  3. Place correct size gauge between lover edge of choke valve and air horn wall.

    Screenshot 2026-01-06 at 8.31.57 AM.png

  4. Apply light closing pressure on choke valve.

  5. Tighten hex head screw on choke shaft.

  6. Using a .036” gauge in vacuum slot (above pin of piston), hold piston in full down position.

  7. Rotate thermostatic spring lever back and forth to check for binding.

  8. Install gasket and choke coil housing assembly.