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H-Series Carburetor for 2-Stroke | Linear Power, Rideability, & No-Hassle Simplicity (38mm)

Name: H-Series Carburetor for 2-Stroke | Linear Power, Rideability, & No-Hassle Simplicity (38mm)
Brand: Lectron Fuel Systems1
SKU: 1438-HV
Price: 549.99 USD
Availability: InStock

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54999

For Riders Who Want

The H-Series delivers excellent top-end power in a no-fuss package. Featuring a high-velocity 38mm bore and cast aluminum body, it's designed for riders who want performance gains without the billet price tag. Comes with 'ready to ride' kit including throttle cable for function and easy install. Simple to tune, and built to ride. Performance made affordable.

Includes

Kit includes the following:

(1) H-Series 38mm Carburetor and setup for vehicle
(1) Throttle Cable for required function
(2) Lectron Stickers
(1) Tuning and Installation guide

Performance made simple.
The H-Series 2-Stroke Carburetor is built for riders who want a cost-effective, no-fuss upgrade with smooth power and consistent throttle response. Featuring a fixed 38mm high-velocity bore and cast aluminum construction, the H-Series delivers better top-end power and improved rideability over stock — all without jetting or constant adjustments.

Whether you’re trail riding, racing on a budget, or just looking to upgrade from stock, the H-Series keeps things simple while still giving you the performance boost you’re after.

🏁 Who It’s For:

Riders looking for simple, reliable performance on a budget. Ideal for 2-stroke riders who want an easy bolt-on upgrade that improves power and throttle response without the complexity or cost of premium carburetors.

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.

Power Jet System

Adds external adjustability of fuel for wide-open throttle positions. Fine tune your top end for increased power without sacrificing midrange - Ideal for racing and high-speed performance.

Proven Performance

Our carburetors are built on well-established fuel delivery principles that have been tested across countless on and off-road applications. Whether you're racing, trail riding, or running a custom build, you can count on predictable throttle response, smooth power delivery, awesome peak power, and long-term reliability.

This is performance you can feel — without needing to overthink it.

Cast Aluminum Construction

Our carburetors feature a precision-cast aluminum body, offering the ideal balance of strength, weight, and affordability. Cast aluminum provides excellent heat resistance and structural integrity, making it well-suited for off-road and high-vibration environments.

Unlike billet or plastic-bodied carbs, cast aluminum keeps costs lower while maintaining reliable performance where it counts. It’s a practical, proven material that delivers real-world durability without adding unnecessary expense.

Full Install Kit Included

Every carburetor kit comes with the required functional components, including a matched throttle cable and basic hardware, to adapt the carburetor for use on most stock setups. While not guaranteed to be a direct bolt-on for every model, these parts are necessary to ensure the carb operates correctly once installed.

This kit is designed to replace OEM controls to ensure proper function — saving you time sourcing the right cable or adapter parts. Fitment may vary depending on your bike or ATV’s specific setup, and additional modifications may be required.

Carb Sizes: Which One is Right?

38 H-Series (High-Velocity)

87mm Overall Length
46mm OD Spigot (Engine Side)
62mm Bell (Airbox Side)

The H-Series is a 38mm High-Velocity carburetor designed to deliver strong top-end power with a simple setup. With an 87mm overall length, it fits the majority of 2-stroke bikes, especially mid-2000s and older models. However, some newer bikes may have tighter clearance between the airbox and rear shock—so be sure to check your available space.

Common OEM carbs replaced:

Keihin PWK 36
Keihin PWK 38
Mikuni TMX 36
Mikuni TMX 38
Other 36–38mm 2-stroke stock carbs

Common fitments:

2-stroke motorcycles and ATVs
Best suited for bikes with mid-length to longer intake space
May require air boot modification on newer models with compressed geometry (e.g., late-model KTM, YZ, or Husqvarna)

If you’re looking for a no-hassle performance upgrade and have space for an 87mm body length, the H-Series is a cost-effective, high-velocity solution built to ride.

38 H-Series Custom

87mm - 120mm+ Overall Length
43mm+ OD Spigot (Engine Side)
55mm+ OD Bell (Airbox Side)

The 38 H-Series Custom is built for special applications where standard fitment just doesn’t cut it. Based on the same high-velocity 38mm bore as the original H-Series, this custom version allows you to tailor key dimensions for your specific engine, chassis, or intake setup.

Customizable specs include:

Overall Length: 87mm – 120mm+
Spigot Outer Diameter: 43mm and up
Bell (air filter) Outer Diameter: 55mm and up

Common uses:

Vintage or custom race bikes
Big bore builds
Chassis swaps or unique intake geometries
Tight-frame or extended manifold setups

If you need a purpose-built 38mm high-velocity carb that fits your exact requirements, the H-Series Custom gives you the flexibility to make it right. Made-to-order for unique builds.

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FAQ

+ What's the difference between Lectron carbs and stock/OEM carbs?

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.

+ Will the carb come pre-tuned?

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.

+ What if I need help with install or tuning?

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.

+ What's the difference between the PRO-SERIES, BILLETRON, and H-SERIES?

Each series is designed for different rider needs and budgets:

PRO-SERIES: Our top-tier carburetor. Fully billet-machined with features like the Torque Jet, Power Jet, Xcelerator metering rod, internal fuel routing and a bore matched to your engine size. Built for serious riders who want maximum performance and tuning flexibility.
BILLETRON: Still billet-machined, but simplified for the rider who isn't looking to tinker with fine tuning. It uses just the Power Jet and Xcelerator rod for a more linear, predictable power-band but still provides excellent acceleration. Great for riders who want performance without constant tuning.
H-Series: Cast aluminum and fixed at 38mm, this is our value option. Simple to install, easy to tune, and ideal for riders who want better top-end power without breaking the bank.

All three perform great — it comes down to how much adjustability and performance you want, and how much you're riding.

Discover more products

Outstanding Performance

I bought the 38 Mil Lectron carburetor for my 1986 250R with only a pipe on it. This carburetor really released the true potential on my 250 with its great performance and throttle response. The throttle cable is a tad bit long but thats absolutely fine as it leaves play in the thumb throttle. Super smooth throttle response and cable. This carburetor and how it performs will turn your machine into a whole different kind of animal. I love the tuning on this thing too. Also not having to change jets for different elevations is nice. Never going back to any other carb I definitely recommend!

Lectron on 93 cr125

Fairly easy installation. Definitely improved throttle response and efficiency. Adds a decent bit of low end torque, which is useful for a 125. Would buy again and would highly recommend.

Incredible performance

I really love my Lectron on my KTM 250xc. Power is great and I get much better fuel mileage than my friends. I would highly recommend this to anyone looking for the closet tihing to fuel injection runs Great!

Best carb you can buy

Bought this for my 2000 kx250. Easily the best purchase I couldve made. The price is a tough pill to swallow but this carburetor will make your bike sing like Adele. Easy installation and Im mechanically inept took me all of 20 minutes. 10/10 would recommend to anyone that rides. My brother has a 2021 yz250 and hes now thinking of getting one of these carburetors after seeing how this carburetor improved my bikes performance and his bike is brand new!

dont hesitate

1997 cr250r, been having a ton of issues with the stock carb, of course bikes been sitting since 08, I've cleaned it, ran horrid, i ultrasonic cleaned it, replaced to all stock jets and tried tuning from there, same problem, horrible idol no matter what i changed, way too much fuel at the top end horrible smoke leaned the main jet out by 20 and dropped the needle all the way, still to much fuel, replaced it with a 300$ ebay carb, thought my body must be worn out and too far gone, and the same problem persisted, so i said f*!k it 500 for a lectron, bolted right on, fired up first kick and idled, i was so happy, i did adjust the needle half a turn because it seemed a bit lean, and boom problem solved and been happy, was about to sell the bike because of the problem

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