25mm SC1 SmartCarb


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25mm SmartCarbs are designed to replace conventional spigot mount top-pull carburetors in 2-stroke applications and will fit most intake manifolds and conventional air boxes that use Keihin PWK 28mm or Mikuni VM 24mm and 26mm carburetors.

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

Every SmartCarb is pre-configured with baseline settings specific to the application for which it is ordered.

Performance Guarantees

  • Ride Faster (+10% Horsepower)
  • Ride Farther (+30% Fuel Economy)
  • Enjoy crisp, clean, linear throttle response bottom to top!

Tuning/Ease of Use

  • Easy External Adjustability (no tools required)
  • Ambient Air Density Compensation (no tuning required for elevation, temperature, or humidity)
  • Accepts all modern stock throttle cables
  • Single Circuit Design (no jets, no accelerator pump, no power-jet)
  • Set it and forget it!

Other Features

  • No fuel spillage (internally vented, sealed system)
  • Reduced emissions output (30-50% reduction)
  • TPS plug-and-play (optional add-on or as a kit)
  • Premium, durable construction
  • Designed and manufactured in the USA

NOTE: A 50.8mm (2 Inch) Ring Adapter (dimension D) must be installed for proper fitment on the following applications:

  • Mini Motocross Bikes (Note: applications that came with the Mikuni VM24 or VM26 stock do not need the adapter)
  • KTM Freerides
  • Trials Bikes
  • Generally any application using a 25 or 28mm PWK carburetor stock
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SKU: 25BAC Category:


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, our billet SmartCarbs have been crafted to the tightest tolerances in order to deliver the excellent performance gains that our customers have come to expect from SmartCarb technology.


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