.155in Bypass Pill Main Jet

The .155in Bypass Pill Main Jet by ENDERLE is a precision fuel metering component designed for high-performance carburetor systems, particularly in drag racing, circle track, and street performance applications. This bypass pill serves as a critical restriction element that controls fuel delivery through the bypass circuit, ensuring optimal air-fuel mixture under varying engine loads and throttle positions. Whether you're tuning a competition engine or fine-tuning a street machine, the correct bypass jet size directly impacts throttle response, mid-range power delivery, and overall drivability characteristics.

Manufactured by ENDERLE, a trusted name in fuel system engineering, this .155-inch bypass pill works in conjunction with your carburetor's primary and secondary circuits to regulate fuel flow during acceleration and part-throttle operation. The bypass jet restricts flow through the bypass fuel passage, forcing fuel down the correct circuits based on engine demand and boost conditions. Precision engineering ensures consistent metering across temperature ranges and fuel pressures, critical for maintaining stable tune in both naturally aspirated and supercharged applications. The compact 1.5 x 0.4 x 2.9-inch form factor allows for easy installation and removal during carburetor tuning sessions, making this an essential item for any serious engine builder's tuning toolkit.

This component is ideal for technicians and racers who demand precision fuel delivery and require the ability to dial in their carburetor tune with surgical accuracy. The .155-inch size represents a specific metering restriction; stocking multiple sizes allows you to tailor your bypass circuit for exact engine displacement, boost levels, and intended application. Compatible with ENDERLE fuel systems and similar carburetor architectures, this bypass pill integrates seamlessly into existing setups without requiring modifications. Whether you're troubleshooting a rich condition, optimizing for track conditions, or building a complete fuel system from the ground up, having the correct bypass jet specification ensures your engine delivers consistent performance lap after lap.