Brosol/Solex Main Jets 135

OVERVIEW

Precision tuning is the heartbeat of a well-running air-cooled engine, and these EMPI Brosol/Solex Main Jets in size 135 are the essential tool for achieving that perfect air-fuel ratio. When you are dealing with the classic Solex or modern Brosol carburetor, the main jet handles the bulk of your fuel delivery during cruising and high-speed operation. If your engine is stumbling during acceleration or running lean at wide-open throttle, upgrading or adjusting your main jet size is often the first step in unlocking hidden horsepower and ensuring engine longevity. These jets are manufactured to exacting tolerances, ensuring that a 135 jet flows exactly as intended, providing consistent performance across all cylinders and preventing the dreaded lean-burn conditions that can lead to overheated heads and melted pistons.

Choosing the right jet size is particularly critical for Volkswagen owners who have moved away from stock configurations. Whether you have installed a high-flow air cleaner, a performance exhaust system like a merged header, or you are simply trying to compensate for the ethanol-heavy fuels found at modern gas pumps, the stock jetting is rarely sufficient. A 135 main jet is a popular choice for 1600cc dual-port engines looking for a bit more "oomph" or for those operating in slightly cooler climates where denser air requires more fuel. By installing these high-quality brass jets, you are investing in the drivability of your Beetle, Bus, or Ghia, eliminating flat spots in the power band and ensuring that your classic VW responds instantly to every input of the pedal. Don''t settle for a "close enough" tune when you can dial in your carburetor with the precision that these EMPI components offer.

FITMENT

These main jets are designed specifically for Solex and Brosol carburetors commonly found on the following Volkswagen models:

• Volkswagen Type 1 Beetle: 1954 through 1977 (Standard and Super Beetle)
• Volkswagen Type 2 Bus / Transporter: 1954 through 1971 (with 1600cc upright engines)
• Volkswagen Type 3 Fastback, Squareback, Notchback: 1961 through 1973 (when using Solex carbs)
• Volkswagen Karmann Ghia: 1956 through 1974
• Volkswagen Thing (Type 181): 1973 through 1974
• Specific Carburetor Models: Fits Solex 28 PICT, 30 PICT-1, 30 PICT-2, 30 PICT-3, 31 PICT-3, 31 PICT-4, and 34 PICT-3, as well as Brosol H30/31 series.

SPECS

• Jet Size: 135 (1.35mm orifice)
• Material: High-quality machined brass for corrosion resistance
• Manufacturer: EMPI
• Part Number: 43-5135-7
• Carburetor Compatibility: Solex and Brosol single-barrel series
• Application: Main fuel circuit tuning
• Quantity: Sold individually

PRO TIPS

PRO TIP 1: The "Plug Chop" Method for Tuning

When you install a new 135 main jet, you must verify that your air-fuel mixture is correct. The best way to do this without a wideband O2 sensor is a "plug chop." Drive your VW at a steady cruising speed in third or fourth gear for a few minutes, then safely pull over and shut the engine off immediately without letting it idle. Remove a spark plug and inspect the porcelain insulator. A light tan or "coffee with cream" color indicates a perfect mixture. If the plug is white or blistered, you are too lean and may need a larger jet. If it is black and sooty, you are too rich and should consider dropping down a size. Consistency is key, so always test under the same weather conditions.

PRO TIP 2: Never Use Wire to Clean Your Jets

It is tempting to use a piece of copper wire or a welding tip cleaner to clear a clog in a jet, but this is a fatal mistake for precision tuning. Brass is a relatively soft metal, and even a small scratch or slight enlargement of the orifice can completely change the flow characteristics of the jet, rendering the "135" stamping inaccurate. If your jet becomes clogged with debris or varnish, always use an aerosol carburetor cleaner followed by high-pressure compressed air. If the clog won''t budge with air, it is far better to replace the jet with a new one than to risk an uneven fuel mixture that could damage your engine.

PRO TIP 3: Consider Your Altitude and Air Density

Remember that jetting requirements change based on where you live and the time of year. If you live at a high altitude (above 5,000 feet), the air is thinner and contains less oxygen, meaning you generally need a smaller main jet to maintain the proper ratio. Conversely, if you are at sea level in a cold climate, the air is very dense and requires more fuel. A 135 jet might be perfect for a sea-level California summer, but if you take that same car into the mountains of Colorado, you might find it running sluggishly rich. Always keep a few different sizes in your glove box tool kit so you can adjust for long-distance road trips or seasonal changes.