SmartCarb For Kawasaki KLX140
Price range: $499.00 through $728.00
Up your game!
The all-new SC3 model SmartCarb kit is compatible with stock or modified (big bore) Kawasaki KLX140 4-stroke dirt bikes, offering crisp, clean throttle response, substantial performance gains, and unparalleled ease of use.
Choose the 26mm SC3 & Fit Kit option if replacing the stock carburetor in a stock bore KLX140. Choose the 28mm SC3 & Fit Kit option if replacing the stock carburetor in 170cc-220cc big bore setup. Forego the Fit Kit option if replacing an aftermarket carburetor of similar size (26mm SC3 replacing a Mikuni VM26/VM28 OR 28mm SC3 replacing a Keihin PWK28)
The Fit Kit option (kit components listed in the Fitment Information tab below) is required when replacing the stock carburetor. 28mm SC3s ordered without the Fit Kit ship with a 50mm (2 inch) filter-side spigot diameter (same as the Keihin PWK28).
Every SmartCarb ships pre-adjusted specifically for your bike setup. Please provide information in the forms below about any engine/exhaust modifications, how you ride (riding style), and what fuel selection you use.
Questions about compatibility or fitment? Contact Us!
Products shipping internationally may be subject to import duties/taxes. Orders & Returns
Description
New Unibody Design!
The SC3 SmartCarb replaces the stock or modified Kawasaki KLX140 carburetor.
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

Keegan –
Don’t buy this and waste money pls.
Keegan Esker –
I bought this carb for my klx140, I put all the things on my bike in the description. I got this supper exited to use it and test it. Knowing it was easy to tune, but it isn’t. First it dosent come tune ready like they said, and second it’s a pain to get in and fit even at an angle. Third the boot for the air box dosent fix and causes air restriction so it never runs good. And the tuning isn’t fast or easy it’s a pain in the but to tune, and never seems to run right. I bought this carb because I thought it was good and easy, because I spend a lot of time for maintenance and I’m pretty good at working on dirtbikes. But this carb sucks pls don’t waste your 600$ and just but a traditional upgraded carb, this carb is no good.