Main Jet DGV, DFV, ICT EPC 130

OVERVIEW

Precision tuning is the heart of a well-running air-cooled engine, and the EMPI 130 Main Jet is a critical component for achieving that perfect stoichiometric balance. Designed specifically for Weber DGV, DFV, and ICT series carburetors, as well as the EMPI EPC variants, this main jet controls the fuel flow during the main circuit of your carburetor''s operation. When you are cruising at higher RPMs or pushing through wide-open throttle transitions, the main jet determines exactly how much fuel is delivered to the combustion chamber. A size 130 jet is a common choice for those looking to fine-tune their mid-to-high range performance, ensuring that your engine doesn''t run dangerously lean or inefficiently rich. Whether you are running a single progressive Weber on a daily driver or dual ICTs on a spirited weekend cruiser, having a library of precise jets like this one is essential for any serious VW mechanic.

At Appletree Auto, we understand that the smallest parts often make the biggest difference in how your Volkswagen performs on the street or the trail. These EMPI main jets are manufactured to exacting tolerances, ensuring consistent fuel flow across all cylinders when used in multi-carburetor setups. The 130 sizing refers to the orifice diameter (1.30mm), providing a specific flow rate that serves as a foundational building block for your carburetor''s jetting map. Using genuine EMPI components ensures compatibility with your existing Weber or EPC hardware, eliminating the guesswork and potential leak points associated with off-brand or poorly machined alternatives. If you have noticed "flat spots" in your acceleration or if your spark plugs are showing signs of a lean condition at high speeds, upgrading or swapping to this precision-machined brass jet is the professional way to recalibrate your fuel system for maximum reliability and power.

FITMENT

This 130 Main Jet is designed for use with the following carburetor models and air-cooled Volkswagen applications:

• Carburetor Compatibility: Weber 32/36 DGV, 32/36 DFV, 32/36 DGAV, 32/36 DGEV.
• Carburetor Compatibility: Weber 34 ICT Single Barrel Carburetors.
• Carburetor Compatibility: EMPI 34 EPC Single Barrel Carburetors.
• Carburetor Compatibility: Holley 5200 Series (Weber Licensed variants).
• VW Type 1: Beetle, Bug, and Super Beetle (All years equipped with aforementioned carburetors).
• VW Type 2: Bus, Transporter, Station Wagon, and Kombi (1600cc to 2000cc engines).
• VW Type 3: Fastback, Squareback, and Notchback.
• VW Karmann Ghia: All years and models.
• VW Type 181: The Thing.
• Off-Road: Sand rails, Dune buggies, and Manx-style fiberglass bodies using Type 1 or Type 4 upright conversions.

SPECS

The following technical specifications define the EMPI 73801.130 Main Jet:

• Jet Size: 130 (1.30mm orifice diameter).
• Material: High-quality, corrosion-resistant precision brass.
• Thread Type: Standard Weber Main Jet pitch for DGV/ICT series.
• Manufacturer: EMPI.
• Part Number: 73801.130.
• Circuit Type: Main Fuel Circuit (High Speed).
• Sold As: Individually (One jet per package).
• Function: Regulates fuel-to-air ratio during primary and secondary venturi operation.

PRO TIPS

1. Read Your Spark Plugs After a High-Speed Run

To determine if the 130 main jet is the correct size for your specific engine displacement and camshaft profile, you must perform a "plug chop." Drive your VW at a sustained high speed (main circuit operation) for several minutes, then safely pull over and shut the engine off immediately without idling. Remove your spark plugs and inspect the porcelain insulator. A light tan or "coffee with cream" color indicates that your 130 jet is likely providing the correct fuel mixture. If the plug is white or blistered, you are running lean and may need to step up to a larger jet. If it is black and sooty, the 130 may be too large, and you should consider a 125 or 120.

2. Account for Altitude and Temperature Changes

Always remember that air density dictates your jetting requirements. If you are tuning your VW at sea level and plan to drive into high-altitude mountain passes, your engine will naturally run richer because the air is thinner. In these cases, a 130 jet that works perfectly at the beach might be too "fat" at 5,000 feet. Conversely, cold winter air is much denser than hot summer air; if you tuned your carburetor in the heat of July, you might find that you need to go up a jet size in January to prevent a lean condition. Keeping a variety of jet sizes in your tool kit allows you to adjust for seasonal or geographic changes quickly.

3. Cleanliness is Paramount During Installation

The orifice in a 130 main jet is incredibly small, and even a microscopic speck of debris can partially clog it, leading to a lean cylinder and potential engine damage. Before installing your new EMPI jets, ensure your carburetor bowls are free of sediment and that you are running a high-quality fuel filter. Never use a metal wire or a drill bit to clean a jet, as this will gouge the brass and permanently alter the flow characteristics. Use only compressed air or specialized aerosol carburetor cleaner to clear the passage. When installing, do not over-tighten the jet; brass is soft, and snugging it down firmly with a properly fitting flat-head screwdriver is all that is required to seat it correctly.