Main Jet DGV, DFV, ICT EPC 200

OVERVIEW

When it comes to squeezing every ounce of power and reliability out of your air-cooled Volkswagen, the devil is truly in the details of your fuel delivery system. This EMPI Main Jet, precision-sized at 200, is an essential component for fine-tuning your Weber DGV, DFV, or ICT, as well as the EMPI EPC series carburetors. The main jet is the heart of your carburetor''s high-speed circuit, responsible for metering the exact amount of fuel that mixes with air as you transition out of the idle circuit and into cruising or wide-open throttle. Whether you are running a spirited 1776cc street engine or a rugged off-road machine, having the correct jetting is the difference between a crisp, responsive throttle and a sluggish, overheating motor that struggles under load. At Appletree Automotive, we understand that "close enough" isn''t in the vocabulary of a true VW enthusiast, which is why we provide these high-quality, brass-machined jets to ensure your air-fuel ratio is dialed in for peak volumetric efficiency.

Precision is paramount when dealing with the delicate balance of an air-cooled flat-four engine. A main jet that is too small will lead to a lean condition, causing cylinder head temperatures to skyrocket and potentially leading to catastrophic engine failure. Conversely, a jet that is too large will wash the cylinder walls with excess fuel, fouling plugs and wasting precious gasoline. This 200-sized main jet is engineered to provide consistent flow characteristics, allowing for predictable tuning sessions and a smoother power band. Constructed from high-grade brass to resist corrosion and fuel additives, these jets are designed to withstand the harsh environment of a vintage engine bay. When you are building a dual-carburetor setup or just refreshing a progressive Weber, choosing the right EMPI jets ensures that your classic VW remains a dependable performer on the highway, the strip, or the trail.

FITMENT

• Volkswagen Type 1 Beetle: All years equipped with Weber ICT, DGV, or EMPI EPC carburetors.
• Volkswagen Type 2 Bus / Transporter: 1950-1979 models running Weber or EMPI performance carburetors.
• Volkswagen Type 3 Fastback, Squareback, Notchback: Performance upgrades using ICT or EPC series carbs.
• Volkswagen Karmann Ghia: All years utilizing progressive or dual Weber/EMPI carburetor conversions.
• Volkswagen Thing (Type 181): Off-road and street applications with Weber-style fuel systems.
• Dune Buggies and Sand Rails: Any air-cooled VW-based engine utilizing Weber DGV, DFV, ICT, or EMPI EPC carburetors.

SPECS

• Part Number: 73801.200
• Jet Size: 200 (.200mm orifice equivalent)
• Material: High-Quality Precision Machined Brass
• Carburetor Compatibility: Weber DGV, Weber DFV, Weber ICT, EMPI EPC
• Circuit Type: High-Speed Main Fuel Circuit
• Thread Pitch: Standard Weber Main Jet Threading
• Quantity: Sold Individually (1 per pack)
• Manufacturer: EMPI

PRO TIPS

1. The "Plug Chop" Method for Perfection

To verify if the 200 main jet is correct for your specific engine displacement and altitude, perform a "plug chop." Drive your VW at a steady cruising speed in third or fourth gear for about a mile, then safely cut the ignition and coast to a stop. Pull your spark plugs and inspect the porcelain color. A light tan or "biscuit" color indicates the jetting is spot on. If the plug is white, you are lean and might need a larger jet; if it is black or sooty, you are rich and may need to step down. Never rely solely on idle quality to determine main jet performance, as the main circuit only fully engages once the throttle plate opens significantly.

2. Compensating for Altitude and Climate

Remember that air density changes with both temperature and elevation. If you are tuning your VW in the middle of a cold winter, your engine will require more fuel (a larger jet) than it would in the heat of the summer. Similarly, if you live in a high-altitude area like Denver, the air is thinner, meaning you will generally need a smaller main jet than someone at sea level. If you plan on a cross-country road trip involving mountain passes, it is always a smart move to keep a small kit of various jet sizes in your glove box so you can adjust your air-fuel mixture on the fly to maintain optimal cooling and power.

3. Proper Installation and Cleaning Hazards

When installing or swapping jets, always use a high-quality, flat-head screwdriver that fits the slot perfectly to avoid "burring" the brass. Brass is soft, and a damaged slot makes future removal nearly impossible. Furthermore, never, ever use a wire or a drill bit to clean a clogged jet. Even a microscopic scratch inside the orifice will change the flow characteristics and ruin the calibration of the jet. If you suspect a clog from debris in your fuel tank, use pressurized carburetor cleaner and compressed air to blow the obstruction out. Keeping your fuel filters fresh is the best way to ensure these precision-sized jets stay clear and functional.