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Revitalize Your Performance with the EMPI Brosol & Kadron Carburetor Rebuild Kit

When it comes to the heart of your air-cooled VW''s fuel system, consistency and precision are everything. The legendary Kadron and Brosol 40/44 EIS carburetors have been a staple of the Volkswagen performance community for decades, offering a "blue-collar" approach to dual-carburetor power that is both reliable and easy to tune. However, even the most robust fuel systems succumb to the passage of time and the harsh realities of modern pump gas. Over time, the internal gaskets become brittle, the accelerator pump diaphragm loses its elasticity, and the needle and seat can develop grooves that lead to flooding or inconsistent fuel bowls. This EMPI carburetor rebuild kit is specifically engineered to restore that factory-fresh throttle response and eliminate the frustrating vacuum leaks that cause "popping" through the exhaust or a wandering idle. Whether you are running a single center-mount setup or a classic dual-Kadron configuration on a high-performance 1776cc or 1914cc build, this kit provides the essential components needed to bring your fuel delivery back to peak efficiency.

Don''t let a gummed-up carburetor stand between you and the open road. Modern ethanol-blended fuels are notoriously aggressive on vintage rubber and paper components, often leading to internal degradation that can clog tiny idle jets and emulsion tubes. This comprehensive tune-up kit is your first line of defense against the "stumble" off the line. By replacing the critical wear items like the needle and seat and the accelerator pump diaphragm, you ensure that your engine receives the precise mixture of air and fuel required for optimal combustion. This isn''t just about fixing a leak; it''s about restoring the drivability and spirit of your Beetle, Karmann Ghia, or Bus. Every component in this kit is manufactured to meet or exceed original specifications, ensuring a perfect fit for the Brosol 40 EIS and 44 EIS series. If you have noticed fuel seeping from the base of the carb or your engine struggles to return to a steady idle, it is time to crack open the bowls and give your Kadrons the professional-grade service they deserve with this EMPI 00-9937-0 master kit.

Detailed Fitment and Compatibility

This rebuild kit is designed for Brosol and Kadron 40 EIS and 44 EIS carburetors. Please note that one kit is required per carburetor. If you are running a dual-carburetor setup, you will need to purchase two kits. This kit is compatible with the following air-cooled Volkswagen models equipped with these specific carburetors:

• Volkswagen Type 1 Beetle / Bug: 1950 through 1977 (Standard and Super Beetle)
• Volkswagen Type 2 Bus / Transporter / Kombi: 1950 through 1971 (With Type 1 upright engines)
• Volkswagen Type 3 Fastback, Squareback, & Notchback: 1961 through 1973
• Volkswagen Karmann Ghia: 1955 through 1974
• Volkswagen Type 181 Thing: 1973 through 1975
• Custom VW Dragsters and Sand Rails: Any Type 1 based engine utilizing Brosol/Kadron 40/44 EIS fuel systems.

Technical Specifications and Kit Contents

This EMPI 00-9937-0 kit includes all the high-wear internal components necessary for a complete top-to-bottom refresh of a single carburetor. Each part is selected for its resistance to modern fuel additives and thermal stability under the high heat of an air-cooled engine bay.

• Part Number: 00-9937-0 (EMPI)
• Application: Fits Brosol 40 EIS, Brosol 44 EIS, and Kadron 40 EIS carburetors.
• Accelerator Pump Diaphragm: High-grade reinforced nitrile rubber for superior fuel resistance and snap-back response.
• Needle and Seat Assembly: Precision-machined brass housing with a Viton-tipped or hardened needle to ensure a perfect seal against fuel pressure.
• Main Body Gaskets: Die-cut heavy-duty gasket material designed to seal the air horn to the main carburetor body.
• Base Gaskets: High-density heat-resistant gaskets for the manifold-to-carburetor interface to prevent vacuum leaks.
• O-Rings and Seals: Complete set of specialized O-rings for the idle mixture screw and various internal passages.
• Copper Washers: Essential for sealing fuel inlet bolts and preventing external fuel spray.
• Compatibility: Designed for use with both 6V and 12V fuel systems.

Professional Installation Tips from the Master Tech

Tip 1: The Importance of a Deep Clean

Simply replacing the gaskets and diaphragms is only half the battle. When you have the carburetor disassembled, you must ensure every internal passage is surgically clean. Use a dedicated carburetor cleaning solvent or an ultrasonic cleaner to remove the "varnish" left behind by old fuel. Pay special attention to the idle jets and the accelerator pump discharge nozzles. Use compressed air to blow out every orifice; never use a wire or a drill bit to clean a jet, as this can enlarge the hole and ruin your fuel calibration. If you don''t get the dirt out now, it will just clog your brand-new needle and seat the moment you turn the key.

Tip 2: Setting the Float Level Correctly

One of the most common mistakes during a Kadron rebuild is ignoring the float level. Even with a new needle and seat, if the float is set too high, the engine will run rich and may flood during hot restarts. If it is too low, you will experience a "lean bog" or fuel starvation at high RPMs. Generally, for a Kadron/Brosol 40 EIS, you want to ensure the float sits level and shuts off the fuel flow before the bowl overflows. Check your specific tuning manual for the exact measurement, but a good rule of thumb is to ensure the float is parallel to the gasket surface when the needle is fully seated.

Tip 3: Don''t Over-Tighten the Hardware

The carburetor body is made of a relatively soft zinc alloy (often called pot metal). It is extremely easy to strip the threads or warp the top plate if you over-torque the screws. When installing the new gaskets from this kit, tighten the screws in a "star" or "criss-cross" pattern to ensure even pressure. Snug them down firmly, but do not crank on them. This prevents the air horn from bowing, which is a leading cause of vacuum leaks that no new gasket can fix. Always use a drop of light oil on the accelerator pump linkage to ensure smooth operation once the new diaphragm is installed.