.055in Bypass Pill Main Jet

The .055in Bypass Pill Main Jet from ENDERLE is a precision fuel metering component designed for high-performance carbureted engines, particularly those running naturally aspirated or supercharged applications. This tiny but critical part controls fuel bypass flow through the main jet circuit, ensuring proper air-fuel mixture ratios across the engine's operating range. Built for serious enthusiasts and professional tuners, the bypass pill main jet is essential when fine-tuning carburetors for maximum efficiency, power delivery, and throttle response on street rods, muscle cars, and competition vehicles.

The .055-inch orifice diameter of this bypass pill determines exactly how much fuel can flow through the bypass circuit under vacuum conditions, directly influencing idle quality, off-idle transition, and part-throttle drivability. ENDERLE's precision engineering ensures consistent metering tolerances, allowing tuners to dial in the exact fuel curve needed for their specific engine combination and intended use. The compact 0.5-inch dimensions make installation straightforward once the carburetor is disassembled—the pill threads or seats into the main jet body, where it acts as a calibrated restrictor to balance fuel delivery against engine demand and manifold vacuum signals.

Carburetor tuners and engine builders rely on bypass pills in various sizes to match fuel metering to engine displacement, cam timing, intake manifold design, and boost levels. The .055in size works well for mid-range displacement engines or as a starting point for larger engines requiring moderate fuel bypass control. Whether you're restoring a classic hot rod, rebuilding a competition carb, or optimizing an existing setup, having the correct bypass pill main jet size is non-negotiable for smooth idle, clean transitions, and predictable performance across all throttle positions. ENDERLE components are trusted by professionals who demand reliability and precision in fuel system tuning.