Main Jet DGV, DFV, ICT EPC 190

OVERVIEW

Precision tuning is the heartbeat of a high-performance air-cooled engine, and the EMPI Main Jet for DGV, DFV, ICT, and EPC carburetors is the essential tool you need to dial in your air-fuel mixture perfectly. Whether you are running a classic Weber 34 ICT dual setup on a daily driver or a progressive DGV on a spirited weekend cruiser, the main jet controls the fuel flow during the primary circuit when you are off the idle circuit and into the throttle. A .190 main jet is specifically designed for engines requiring a richer fuel delivery to match high-flow air intakes or performance camshaft profiles. By utilizing these precision-machined brass components, you ensure that your Volkswagen isn''t running lean, which is the leading cause of overheating and catastrophic engine failure in the air-cooled world.

At Appletree Auto, we understand that "close enough" isn''t good enough when it comes to carburetion. These EMPI main jets are manufactured to exacting tolerances to provide consistent flow rates across all cylinders. This is particularly crucial for the EPC and ICT series carburetors commonly found on Type 1 and Type 2 powerplants. If you have noticed a stumble during mid-range acceleration or your spark plugs are showing a white, blistered insulator, it is likely time to step up your jetting. This .190 jet offers the volume necessary for larger displacement engines or those operating at lower altitudes where air density is higher. Don''t settle for generic, unbranded jets that lack the calibration accuracy required for a finely tuned VW; trust the legacy of EMPI to keep your flat-four running cool and strong.

FITMENT

This main jet is designed for use with specific Weber and EMPI carburetor bodies typically found on the following Volkswagen models equipped with aftermarket induction systems:

• Volkswagen Beetle: 1950 through 1979 (Standard and Super Beetle)
• Volkswagen Karmann Ghia: 1956 through 1974
• Volkswagen Bus / Transporter / Type 2: 1950 through 1979
• Volkswagen Type 3 (Fastback, Squareback, Notchback): 1961 through 1973
• Volkswagen Thing / Type 181: 1973 through 1974
• Carburetor Compatibility: Weber DGV, DFV, and ICT series.
• EMPI Compatibility: EPC 38 and EPC 40 series.
• Holley Compatibility: Fits various Holley-Weber progressive 5200 series carburetors.

SPECS

The technical specifications for this component ensure compatibility with standard tuning kits and original carburetor housings:

• Product Brand: EMPI
• Manufacturer Part Number: 73801.190
• Jet Size: .190 (1.90mm orifice)
• Material: High-quality, corrosion-resistant precision-machined brass
• Thread Pitch: Standard Weber / EMPI main jet threading for ICT/DGV series
• Application: Main fuel circuit (High-speed circuit)
• Quantity: Sold individually (Sold Each)
• Interchange: Compatible with Weber 73801 series jetting

PRO TIPS

Tip 1: The Art of the Plug Chop

To verify if the .190 main jet is the correct size for your specific engine build, perform a "plug chop." Drive your VW at a sustained high RPM (where the main circuit is fully active) for about 30 seconds, then safely cut the ignition and coast to a stop. Pull your spark plugs and inspect the ceramic insulator. A light tan or "coffee with cream" color indicates a perfect mixture. If the plug is white, you are still too lean; if it is sooty black, the .190 may be too large for your current venturi and air corrector combination.

Tip 2: Incremental Tuning is Key

Never jump more than two jet sizes at a time when tuning your carburetor. Air-cooled engines are extremely sensitive to fuel changes. If you are moving from a .170 to a .190, monitor your cylinder head temperatures (CHT) closely. Increasing the main jet size will generally lower your CHTs by providing more fuel for internal cooling, but going too large will cause "fuel wash," where excess gasoline thins the oil on your cylinder walls, leading to premature ring wear. Always keep a log of your jet changes and the resulting engine behavior.

Tip 3: Brass is Soft - Handle with Care

When installing your new EMPI main jets, remember that they are made of precision brass and can be easily deformed or marred. Always use a flat-head screwdriver that fits the slot of the jet perfectly. A screwdriver that is too small will "chew" the brass, creating burrs that can disrupt fuel flow or make future removal nearly impossible. Ensure the carburetor bowl is free of debris before installation, as even a tiny speck of dirt can clog a .190 orifice and cause a lean-out condition on that specific barrel.