Lectron BILLETRON Pro-Series 38mm Carburetor - MADE IN USA - 1038-PRO-78-YZ125
2000-2025 Yamaha YZ125 & 2020-2025 YZ125X (2T models)
Features:
The PRO-SERIES delivers unmatched throttle response, torque, and top-end power through a precision-machined billet bore design and advanced internal fuel circuitry. Every component is purpose-built for performance, including a fully integrated dual-jet system, and proprietary Xcelerator metering rod. It’s our most responsive, most refined, and most race-ready carburetor. Power made easy.
Unleash Maximum Performance for Your 2-Stroke Engine -
The Lectron PRO-SERIES carburetor is the ultimate high-performance carburetor for 125cc-500cc 2-stroke engines. Engineered for instant throttle response, increased horsepower, and unmatched rideability with effortless external adjustments that take out the hassle. This carburetor is built for racers, trail riders, weekend warriors, and serious performance enthusiasts.
With precision airflow dynamics, the XCELERATOR Metering Rod, and cutting-edge Torque Jet system, The PRO-SERIES line up optimizes fuel delivery to give you explosive acceleration and seamless power across all RPM's.
Xcelerator Metering Rod -
Provides a burst of fuel enrichment when ‘whacking’ the throttle for instant throttle response in all RPM’s. This innovation is a leap in metering rod technology by sustaining the hassle-free, no jetting benefits, while leveling up performance and throttle response. No compromise, just power made easy.
Torque Jet Technology + Power Jet System -
The PRO-SERIES combines our newly designed Torque Jet Technology in addition to the Power Jet System. Designed to deliver power exactly where you need it — the bottom-end grunt and wide-open throttle performance is unrivaled. The torque jet design activates at low throttle openings to improve off-idle response and drive out of corners, while the power jet kicks in at higher RPMs to maintain strong top-end fueling without bog or drop-off.
Together, these two circuits and the Xcelerator Metering Rod create an incredibly responsive throttle at all RPM and put real power to the ground without hesitation. Whether you're trail riding, racing MX, or pushing through deep sand, the PRO-SERIES is designed for performance, and delivers.
Internal Fuel Circuits -
Fully optimized internal fuel circuit routing, meaning the power jet and torque jet systems are fed through machined passages inside the carburetor body — not external hoses. These fuel passages have been designed to expedite fuel delivery by reducing the required vacuum necessary to pull fuel through each circuit and also shortens the fuel travel path which allows for near immediate fuel delivery. The result, a noticeably quicker throttle response and immediate power transfer to the ground.
By eliminating external fuel hoses, the PRO-SERIES not only looks cleaner but is also easier to install and less prone to hose-related damage in harsh riding conditions.
Tailored Bore Design -
Unlike one-size-fits-most OEM carbs, our bore is precision-tailored to match your engine's air volume for sharper throttle response and better power delivery. It's like a well fitted suit vs one from your dad's closet - mass applied sizing doesn't cut it. Avoid the pitfalls of generic carbs. Get fitted.
