Throttle Cable Barrel, Sold Each

OVERVIEW

When you''re out on the trail in a sand rail or cruising the boulevard in a classic Beetle, the last thing you want is a failure in your throttle response. This EMPI Throttle Cable Barrel, part number 311-129-777, is a tiny but mighty component that serves as the critical junction between your accelerator cable and the carburetor linkage. It is often the "missing link" that keeps an air-cooled engine running smoothly. Whether you are running a stock Solex single-carburetor setup or a high-performance dual-carburetor linkage from Weber or Dellorto, this barrel clamp provides a secure, non-slip attachment point that ensures every millimeter of pedal travel translates directly into engine RPM. Its robust design is intended to withstand the high-vibration environment of the VW engine bay, providing peace of mind for both daily drivers and off-road enthusiasts alike.

At Appletree Automotive, we know that versatility is key when it comes to custom Volkswagen builds. That is why this throttle cable barrel is engineered with a generous 5mm center hole, making it compatible with a wide variety of cable thicknesses. While it is a direct factory-style replacement for late-model Type 1 and Type 2 vehicles, its utility extends far beyond stock applications. Many builders utilize this barrel for custom push-pull cable setups or specialized throttle linkages by slightly over-drilling the center hole to accommodate thicker heavy-duty cables. It is an essential item to keep in your glove box or emergency tool kit, as a stripped or lost barrel nut can leave you stranded. Sold individually, these barrels are an affordable way to ensure your throttle linkage remains crisp, responsive, and reliable under any driving condition.

FITMENT

• Volkswagen Beetle (Type 1): 1965, 1966, 1967, 1968, 1969, 1970, 1971, 1972, 1973, 1974 (Standard & Super Beetle)
• Volkswagen Karmann Ghia: 1965, 1966, 1967, 1968, 1969, 1970, 1971, 1972, 1973, 1974
• Volkswagen Bus (Type 2 / Transporter): 1965, 1966, 1967, 1968, 1969, 1970, 1971
• Volkswagen Thing (Type 181): All Years
• Custom Applications: Dune Buggies, Sand Rails, Trikes, and Baja Bugs using VW-style linkages.

SPECS

• Manufacturer: EMPI
• Part Number: 311-129-777 (Ref: 00-3171-7)
• Outer Diameter (OD): 7.5mm
• Total Length: 12mm
• Center Hole Diameter: 5mm
• Material: Zinc-plated steel for corrosion resistance
• Fastener Type: Slotted set screw
• Quantity: Sold Individually (Each)

PRO TIPS

1. Prevent Cable Fraying During Installation

One of the most common mistakes when installing a new throttle cable barrel is tightening the set screw onto a frayed cable end. To ensure a professional connection, always use a sharp pair of cable cutters to get a clean snip before sliding the cable through the 5mm hole. If you are working with an older cable that is already starting to unravel, apply a small drop of solder or a tiny piece of heat-shrink tubing to the tip of the cable before inserting it into the barrel. This prevents the individual wire strands from spreading out, which would otherwise make it impossible to pass through the barrel or cause the set screw to only grip half of the strands, leading to premature cable failure.

2. The "Double-Check" Tension Technique

Achieving the perfect throttle response requires precise tension. Before you tighten the set screw on the barrel, have a helper sit in the driver''s seat and press the accelerator pedal all the way to the floor. Manually open the carburetor butterfly valve to the wide-open position, then slide the barrel up against the linkage arm and tighten it down. Once tightened, have your helper release the pedal and verify that the throttle returns completely to the idle stop. There should be just a tiny amount of slack (about 1-2mm) in the cable at idle to ensure the engine doesn''t hang at high RPMs. Always use a drop of blue thread locker on the set screw to prevent it from vibrating loose over time.

3. Custom Drilling for Heavy-Duty Cables

If you are building a heavy-duty off-road rail or a racing application that utilizes a thick "push-pull" style Morse cable, you may find that the stock 5mm hole is slightly too tight. Because these barrels are made of solid steel, you can safely use a drill press to slightly enlarge the center hole to accommodate a larger diameter cable. When doing this, ensure you do not drill so large that you compromise the threads of the set screw. After drilling, use a small file to deburr the edges of the hole so the cable can slide through without snagging. This allows you to maintain the convenience of the VW-style barrel interface while upgrading to the extreme durability of industrial-grade cables.