Compatible with PRO-SERIES & BILLETRON Products
Fine-tune your idle with precision. This Idle Circuit Screw is a direct replacement for PRO-SERIES and BILLETRON carburetors equipped with externally adjustable idle circuits. Machined for smooth threading and consistent control, it allows quick adjustments to idle fuel delivery—ideal for dialing in cold starts, low-speed stability, and off-throttle transition.
Whether you’re replacing a worn screw or setting up a fresh build, this is a small part that makes a big difference in rideability.