.100in Bypass Pill Main Jet

The .100in Bypass Pill Main Jet is a precision fuel system component engineered for carbureted performance engines and fuel injection systems requiring metering control. This brass jet assembly is essential for builders, racers, and restoration specialists who demand exact fuel atomization and delivery. The bypass pill function regulates fuel flow during transient conditions, ensuring consistent engine response across varying throttle positions and load states.

Manufactured by ENDERLE, a trusted name in high-performance fuel system engineering, this .100 inch internal diameter main jet is machined from durable brass stock for corrosion resistance and precision fit. The 0.5 x 0.5 x 0.5 inch dimensions reflect its compact, hardened design optimized for carburetor main well or fuel block applications. The bypass pill restricts fuel flow during high-velocity conditions while allowing fuller flow during cruise and idle transitions, fine-tuning the air-fuel ratio across the engine's operating range. This metering approach reduces fuel consumption while maintaining throttle responsiveness without sacrificing reliability.

Racers, engine builders, and carburetor specialists select this main jet when restoring vintage competition carburetors or tuning modern carbureted platforms for maximum efficiency. The .100in ID specification is critical—oversized or undersized jets compromise fuel distribution and engine performance. Installation requires proper carburetor disassembly and knowledge of fuel system architecture; this jet integrates into ENDERLE carburetors and compatible fuel blocks. Verify your carburetor model and jet sizing requirements before ordering to ensure seamless fitment and optimal calibration for your specific engine displacement and fuel system configuration.