H-Series EVO Carburetor for 2-Stroke | Performance + Simplicity (38mm)

The EVO combines the best of both. Compared to the cast H-SERIES, it’s billet-built for durability, has tighter tolerances, and adds features like the SafeDrain™ bowl, anodizing options, and easier fitment for modern models with its compact 78mm body. Compared to the Standard Billetron, it delivers smoother throttle response with the Xcelerator™ metering rod while keeping the simplicity of a single-circuit design. EVO is essentially the modern evolution of both — stronger, faster, and simpler.

The EVO is designed as the everyday upgrade — simple, billet-strong, and perfect for most riders. The PRO-SERIES is our flagship carburetor, built for riders who want maximum adjustability, throttle hit, and race-level performance while the H-SERIES EVO improves on the performance of the old H-SERIES and standard BILLETRON while retaining ultimate simplicity.

Yes. The EVO replaces both the cast H-SERIES and the standard Billetron 38mm & 40mm. It carries forward their strengths while adding billet construction and modern upgrades.

Absolutely. We continue to support legacy models with replacement parts and service, so your existing carb is fully covered.

The EVO is a billet-built upgrade of the original H-SERIES. It features a 6061 billet aluminum body, anodizing options, a SafeDrain™ overflow bowl, a hard-anodized billet slide, and our Xcelerator™ metering rod for faster throttle response. It’s stronger, smoother, and more precise — but still keeps Lectron’s set-it-and-forget-it simplicity.

Lectron carbs are built for riders who want simplicity without compromising performance.

Unlike stock carbs that rely on jets and constant tuning, Lectron uses a metering rod system that automatically adjusts fuel delivery based the conditions around you (elevation, temperature, humidity, etc..) . No jets to swap. No guessing. Just ride.

Here’s what sets us apart:

• No Jetting Required – Adapts to changes in altitude, temperature, and mods automatically.
• Smooth, Predictable Power – Strong bottom-end and midrange torque with linear throttle response.
• Fewer Parts, Less Tuning – Simpler design means less time wrenching and more time riding.
• Built for Performance – Whether you're racing or trail riding, you get better performance without the hassle.

It’s the performance you want, with the simplicity you’ve been missing.

We have over 50 years of experience with tuning carburetors. We setup each carb to a fundamentally determined setting based on information you provide to us. Your carb will be very close or spot on when received. With that said, varying factors like the bikes condition, wear, maintenance, oil ratio, and age of fuel can have an effect with tuning. We suggest a simple, slight tuning at install to achieve max performance and preferability. Once you set it, forget it. Enjoy no-hassle.

No problem - we've got you covered. Our dedicated support team has extensive experience tuning and installing Lectron carburetors across a wide range of bikes and riding styles. Whether you're working through your initial setup or fine-tuning for specific conditions, we're here to help. Reach out anytime - we'll make sure your carb is dialed in and your bike runs like it should.