SmartCarb For GasGas TXT 250/280/300
$529.00
Precision fueling for ultimate control.
The all-new 28mm SC3 model SmartCarb replaces the stock 28mm Keihin PWK in GasGas TXT 250, 280, and 300 trials bikes, offering crisp, clean performance, substantial peak RPM overrev, and incredible ease of use.
Every SmartCarb ships pre-adjusted specifically for your bike setup. Please provide information in the forms below about any engine/exhaust modifications and what fuel selection and oil premix ratio you use.
Questions about compatibility, sizing, or fitment? Contact Us!
Products shipping internationally may be subject to import duties/taxes.
Description
New Unibody Design!
The SC3 SmartCarb replaces the stock GasGas TXT carburetor in 250, 280, and 300cc trials bikes.
The SmartCarb SC3 is precision air/fuel metering instrument that provides extremely fine fuel atomization, precise mixture control, and automatic air density compensation in a single circuit, externally adjustable, jet-less fuel system.
SC3 Upgrades:
- Ludicrously Simple Design | CNC billet machined unibody construction
- O-ring Float Bowl Gasket | Improved sealing and sleeker look
- “Tucked” Fuel Fitting | Improved fuel line routing
- Crisper Clicker Haptics | Improved clicker adjustment feel
- Improved Fuel Rate| 2X dump passages for quicker float bowl fueling response
- Reduced Part Count | Cost savings passed to our customers (-$100)
SmartCarbs are proudly designed and manufactured in the USA!
Learn more about How It Works

Steve Anderson (verified owner) –
2021 Gas gas TXT280 running on vp110 non-oxygenated. E-f31 metering rod at 49 clicks and idle @.769 it starts easily with no throttle needed. Revs smooth and strong with a nice top end rev. Tried the richer E-f30 needle and the top end screams. Might be good for a lighter rider. My weight is 210lbs, might be something to consider when setting up.
Thank you so much, extremely happy with your carb, best of all I like the no dribble factor out of the carb . MERRY CHRISTMAS 🎄 TO YOU AND ALL YOUR EMPLOYEES.
Dale Malasek –
For the last several years I have worked closely with the developer of the SmartCarb, Corey Dyess, to bring SmartCarb technology to GasGas Trials Bikes and I can now say that we have nailed it! I have the first production 28mm Billet SmartCarb on my 300cc Factory Replica TXT Pro and it performs absolutely perfect. I’ve ridden from 980 ft (here in Kansas City) up to elevations as high as 11,600 ft in Colorado with no adjustments necessary other than an idle screw tweak here and there to my liking. What a relief to never have to change jetting anymore for the altitude you’re riding at! The carb is very easy to set and can be adjusted without any tools or hassle by using the mixture clicker adjuster on top of the carb and once it’s dialed in, you forget it. The SmartCarb adds noticeable power from idle all the way up to the rev limit of the engine while giving very fine throttle control. You will experience a smooth and controllable power increase throughout the RPM range and I’ve seen my fuel economy increase too, which is also a big bonus! The SmartCarb improves every operational aspect of my bike and at this point, I’d be hard pressed to ride without it.
– Dale Malasek, Trials Importer
GAS GAS USA, Inc. & Mecatecno