Main Jet, 130 for D-Series Carb, Sold Each

OVERVIEW

Precision tuning is the difference between a Volkswagen that simply runs and one that truly screams across the pavement or the dunes. The EMPI 130 Main Jet for D-Series carburetors is an essential component for any air-cooled enthusiast looking to dial in their fuel delivery system with surgical accuracy. Designed specifically for the D-Series (HPMX) and Weber IDF-style carburetors, this main jet controls the volume of fuel metered into the engine during high-speed operation and wide-open throttle. When your engine transitions out of the idle circuit and into the main circuit, the size 130 jet ensures that your air-fuel ratio stays within the sweet spot, preventing the dangerous lean conditions that lead to overheating or the sluggish performance caused by an over-rich mixture. Whether you are building a street-ready 1600cc dual-port or a high-revving 1776cc weekend warrior, having the correct jetting is non-negotiable for engine longevity and throttle response.

Crafted from high-quality, corrosion-resistant brass, these EMPI jets are machined to exacting tolerances to ensure consistent flow rates across every unit. In the world of air-cooled VWs, we know that ambient temperature, altitude, and exhaust backpressure all play a role in how your carburetor performs. The 130 main jet is a popular choice for many mid-sized engine builds, providing a reliable baseline for tuners who demand excellence. At Appletree Automotive, we understand that a single jet can make or break your Saturday afternoon cruise. That is why we provide genuine EMPI components that fit perfectly and perform reliably under the heat and vibration common to the VW engine bay. Don''t settle for "close enough" when it comes to your fueling; upgrade your D-Series carburetors with the precision they deserve and feel the difference in every gear pull.

FITMENT

This 130 Main Jet is designed for use in the following carburetor models and vehicle applications:

• Carburetor Compatibility: EMPI D-Series (HPMX) and Weber IDF Series.
• Volkswagen Type 1: Beetle, Super Beetle, and Karmann Ghia (Typically utilized in dual-carburetor configurations).
• Volkswagen Type 2: Bus, Transporter, and Kombi (Ideal for upgraded Type 1 or Type 4 engine conversions).
• Volkswagen Type 3: Squareback, Fastback, and Notchback models running aftermarket D-Series setups.
• Volkswagen Type 181: The Thing.
• Off-Road: Sand Rails, Dune Buggies, Manx-style bodies, and Baja Bugs.
• Custom Builds: Any air-cooled engine utilizing D-Series or IDF-style performance carburetors.

SPECS

Technical specifications for the EMPI 44-1054-0 Main Jet:

• Jet Size: 130 (1.30mm orifice).
• Series Compatibility: D-Series (HPMX) / Weber IDF.
• Material: Precision Machined Solid Brass.
• Thread Pitch: Standard D-Series / IDF Main Jet threading.
• Manufacturer: EMPI.
• Part Number: 44-1054-0.
• Sold As: Individually (Each).
• Function: High-speed / Main circuit fuel metering.

PRO TIPS

1. The Art of Reading Your Spark Plugs

When you install a 130 main jet, it is critical to perform a "plug chop" to verify your tuning. After a sustained run at mid-to-high RPMs, safely pull over and inspect the ceramic insulator of your spark plugs. A light tan or "coffee with cream" color indicates that your 130 jet is likely the correct size for your engine and altitude. If the plug is white or blistered, you are running too lean and may need to jump up to a 135 or 140 jet to prevent piston damage. If the plug is soot-black or oily, the 130 might be too rich for your specific setup, and you should consider stepping down. Remember, air-cooled engines rely on fuel for cooling as much as they do for combustion, so err slightly on the side of rich if you are unsure.

2. Compensating for Altitude and Oxygen

Atmospheric pressure has a massive impact on how your 130 main jet performs. If you are tuning your VW at sea level, a 130 jet might be perfect for a 1641cc engine. However, if you take that same Bug up into the mountains, the thinner air will make your engine run richer because there is less oxygen to burn the fuel provided by the jet. As a general rule of thumb, for every 3,000 to 5,000 feet of elevation gain, you may need to decrease your jet size by one increment. Always keep a small assortment of jets in your tool roll so you can adjust your D-Series carbs for the local environment, ensuring your engine doesn''t "bog" when the air gets thin.

3. Cleanliness is Next to Godliness

The orifice in a 130 main jet is incredibly precise, and even a tiny speck of debris from an old fuel tank can cause a massive lean stumble or "popping" through the carburetor. When installing your new jets, always use a high-quality fuel filter and ensure your carburetor bowls are free of sediment. Never use a steel wire or a needle to clean a brass jet, as these can scratch or enlarge the orifice, effectively changing a 130 jet into something much larger and ruining your tune. Use pressurized carburetor cleaner and compressed air only. When screwing the jet into the jet stack, ensure it is snug but do not over-tighten, as brass is a soft metal and can deform easily under excessive torque.