Throttle Body
- Remove accelerator pump rod from throttle lever by rotating rod until tang aligns with slot in lever.NOTE: Further disassembly of throttle body is not required for normal cleaning. Throttle valve screws are permanently staked in position. Throttle body is serviced as complete assembly. DO NOT remove mixture screw plugs unless diagnosis indicates the carburetor is cause of poor engine performance or idle mixture needles or throttle body must be replaced.
- Turn throttle body over, and position on a holding fixture with manifold side up. Make 2 parallel cuts in throttle body using small hacksaw, cutting on each side of idle mixture needle plug. Cuts should reach down to steel plug, but no more than 1/8" beyond locator points. Distance between saw marks will depend upon size of punch used.
- Place a flat punch at a point near ends of saw marks. Hold punch at 45 degree angle and drive it into throttle body until casting breaks away, exposing steel plug.
- Hold punch vertically and drive it into steel plug. Then hold punch at 45 degree angle and drive plug out of casting. Repeat process for remaining mixture needle. Using Wrench (J 29030 B or BT 7610B), remove idle mixture needles. Refer to the BENCH ADJUSTMENT procedure under IDLE MIXTURE in this article.
NOTE:
Hardened steel plug will shatter. It is not necessary to remove plug completely. Remove just enough pieces to allow idle mixture adjusting tool to be used to remove mixture screws and springs. Idle mixture screw head has a "double-D" configuration and can also be removed using a piece of 7/32" copper tubing that has been partially flattened.