Stage 1: Basic machining to increase the carburetor venturi to 16mm. Approx 0.5HP increase over a standard carburetor.
Stage 2: Extensive machining and polishing to the carburetor venturi for increased airflow. Approx 1HP increase over a standard carburetor.
Stage 3: Extensive machining and polishing to the venturi to a finished size of 16.5mm. Other areas of the carburetor machined for increased airflow and fuel circuits reworked. The direct increase in engine performance varies depending on the state of tune of the engine, but in the region of 1 to 2HP.
