40mm SC2 SmartCarb


36, 38, and 40mm SC2 SmartCarbs are designed to replace conventional carburetors in 2-stroke applications from 125cc up to 500cc or more. They are a direct fit in applications originally equipped with Keihin PE, PJ, PWK and Mikuni VM and TM series carburetors of similar sizes. 36mm size depicted.

Every SmartCarb ships pre-tuned with baseline settings specific to the application for which it is ordered. Questions about sizing, fitment, or compatibility? Contact Us!

New orders ship within 2 weeks from the order date. For our international customers, please note that any applicable import duties or taxes are the purchaser’s responsibility.

Performance Guarantees

  • Ride Faster | 10% more power
  • Ride Farther | 25-30% greater fuel economy
  • Crisp, clean, responsive throttle inputs bottom to top!

Tuning/Ease of Use

  • Make adjustments trail/track-side by hand, in seconds (no tools required)
  • Complete air density compensation (consistent air/fuel ratios at any elevation or temperature)
  • Accepts all modern stock throttle cables
  • Single circuit design (NO Jets!)
  • Set it and forget it!

Other Features

  • Zero fuel spillage (internally vented, sealed system)
  • TPS plug-and-play (optional add-on or as a kit)
  • Reduced emissions (30-50% reduction)
  • CNC billet construction
  • Designed and manufactured in the USA

NOTE: Throttle Position Sensor (TPS) required for:

  • Applications using 3D ignition mapping requiring TPS input (later year YZ250s, KX250s, RM250s, and the new 2022 YZ125s)
  • Applications using TPS input for oil injection (Betas) or for servo controlled power valves (later year CR250s)
  • Applications using aftermarket ECUs with advanced mapping features requiring TPS input (PowerCDI)
Product total
Options total
Grand total
SKU: 40BAK Category:


SmartCarb SC2

We’ve spent years refining every facet and feature of the SC2, making it the biggest leap forward for our flagship model since 2012. This new generation of SmartCarb provides the same unmatched performance gains enjoyed by thousands of customers in over 80 countries worldwide – now in the most accessible, plug-and-play format we’ve ever made.

  • Substantially shorter end-to-end (direct fit for all modern 2-stroke dirt bikes)
  • Revised throttle cable retention (works with stock throttle cables)
  • Integrated, internal vent passages (clean, slim form-factor)
  • TPS plug-and-play (optional)
  • Premium anodized float bowl color options now available!

SmartCarbs are designed and manufactured in the USA to provide extremely fine fuel atomization, precise air/fuel mixture control, and ambient air density compensation. These innovative features are delivered in a single-circuit, flat slide, variable venturi, mechanical fuel system.

Hewn from beautiful billet aluminum, the SC2 has been crafted to the tightest tolerances in order to deliver the excellent performance gains that our customers have come to expect from patented SmartCarb technology.


There are no reviews yet.

Be the first to review “40mm SC2 SmartCarb”

Your email address will not be published.


Go to Top