SmartCarb For Kawasaki KLX140


Up your game.

This 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.

Every SmartCarb ships pre-adjusted specifically for the bike for which it is ordered. Please provide information in the forms below about any engine/exhaust modifications, how you ride (riding style), and what fuel selection you use.

Choose the 26mm SC2 & Fit Kit option if replacing the stock carburetor in a stock bore KLX140. Choose the 28mm SC2 option if replacing the stock or aftermarket carburetor with similar dimensions such as the Keihin PWK28 (35mm engine-side spigot OD, 50mm filter-side spigot OD). In general we recommend the 26mm SC2 option for stock KLX140s and the 28mm SC2 option for bikes with 170-220cc+ big bore kits.

The Fit Kit option (kit components are listed in the Fitment Information tab below) is required when replacing the stock carburetor. If replacing a Keihin PWK28 or similarly sized aftermarket carburetor, the Fit Kit option may be redundant. Components required to adapt the Keihin PWK28 or similarly sized aftermarket carburetors (intake, throttle cable, and airbox rubber boot) are compatible with the 28mm  SC2.

Remote choke is optional.

Questions about compatibility or fitment? Contact Us!

Products shipping internationally may be subject to import duties/taxes.

SKU: SC2-KAW140 Categories: ,


The SC2 SmartCarb is a precision metering instrument that provides extremely fine fuel atomization, precise mixture control, and air density compensation in a single circuit, jet-less fuel system.

  • CNC billet aluminum construction
  • Patented single fuel circuit design
  • Extremely fine fuel atomization
  • Optimal air/fuel ratio control
  • Designed & manufactured in the USA