SmartCarb For Rieju MR 300


The torch burns bright for Spanish Enduro Tradition!

This 38mm SC2 model SmartCarb replaces the stock 38mm Keihin PWK carburetor in Rieju MR Pro/Racing/Six Days 300 dirt bikes, offering exceptional performance, efficiency, and 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 and oil premix ratio you use.

Questions about compatibility, sizing, or fitment? Contact Us!

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

SKU: SC2-38-RJU300 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