4-Stroke Carburetor Mods

Carbs are taper-bored to improve overall power without loss of low end response. Other options include adjustable fuel screw, leak jet, and externally adjustable fuel\air delivery devices. Click on 4 - Stroke carb mods for more info.

(Stage 1) Includes the adjustable leak jet and installation, an adjustable fuel screw, re-jetting, and accelerator pump mods. You can expect instant throttle response, crisp jetting and no hesitation. ($250) 

(Stage 2) The taper bore modification increaces flow by 15% on 39mm FCR carburetors. For best results, the intake manifold should be matched to the modified carburetor. If you are looking for more power, this is where to start ($150)

(Stage 3) In addition, the Dial-a Jet or Intelajet can be added for even better results. These devices deliver pre-mixed air /fuel based on engine load. This means you can run leaner main jetting for inreased horsepower, throttle response, elevation range, and fuel milage. These units are externally adjustable, however, on 4-stroke applications if you want the ability to adjust easily, the Intelajet is recommended. ($165 installed Dial a jet) ($275 installed Intelajet)