Concealment Plug Removal

Fig. 26 Typical concealment plug removal:

Idle mixture adjusting screws are factory sealed to retain adjustment settings. If idle mixture adjustment is necessary, concealment plugs sealing mixture screws must be removed. Refer to following procedure to remove concealment plugs.
1. Remove carburetor from engine. Invert carburetor and drain fuel into a suitable container.
2. Mount carburetor in a suitable holding fixture with manifold side facing up.
3. Using a hack saw, make two parallel cuts on either side of locator point beneath mixture screw plug, Fig. 26. Cuts should reach down to steel plugs, but should not extend more than 1/8 inch beyond locator points. Distance between saw cuts depends on size of punch to be used.
4. Place flat punch near end of saw cuts.
5. Holding punch at a 45° angle, drive it into throttle body until casting breaks away, exposing a steel plug.
6. Holding a center punch at a 90° angle, drive punch into steel plug.
7. Holding center punch at a 45° angle, drive steel plug out of throttle body. Plug will shatter rather than remain intact. It is not necessary to remove plug completely. Remove loose pieces of plug to allow use of mixture adjusting tool, J-28706, or a 3/16 inch deep socket.
8. Repeat steps 3-7 for remaining mixture screw, if equipped.
9. Reinstall carburetor on engine.