225 - 1BBL Holley Carburetor & 225 - 2BBL Carter Carburetor Information

FIGURE 2:

225 - 1BBL Holley Carburetor

1. Remove air cleaner assembly, vacuum hoses, etc.

2. Locate and center punch 1/4" from end of mixture screw housing. The center punch mark should be indexed at about the 2:00 o'clock position (see Figure 2).
3. Using a 3/16" drill bit, drill through the outer section of the mixture screw housing at the center punch mark.

4. If the concealment plug does not pop out when the drill bit enters the plug cavity, use a small drift, punch, or "L" shaped Allen wrench to pry out plug. Retain plug for reinstallation.

CAUTION: NEVER PLACE ANY TOOL AGAINST THE MIXTURE SCREW DURING THIS OPERATION.

5. Reinstall air cleaner assembly vacuum hoses, etc.

6. Perform propane idle RPM adjustment per applicable service manual procedure.

7. Reinstall concealment plug.

FIGURE 3:

225 - 2BBL Carter B.B.D. Carburetor (Miser Truck)

1. Remove air cleaner, vacuum hoses, throttle linkage, etc.

2. Locate and center punch on the side surface of the mixture screw housing 5/16" from the front end of the housing in the center of both mixture screw housings (see Figure 3).
3. Using a 3/16" drill bit, drill at a right angle (90~) to the mixture screw housing through the outer surface of the housing.

4. Use a small drift, punch or "L" shaped Allen wrench to pry out plug. Retain plug for reinstallation.

CAUTION: NEVER PLACE ANY TOOL AGAINST THE MIXTURE SCREW DURING THIS OPERATION.

5. Reinstall air cleaner assembly, vacuum hoses, throttle linkage, etc.

6. Perform propane idle RPM adjustment per applicable service manual procedure.

7. Reinstall concealment plug.