Pneumatic exhaust valve Rotax 122 engine d=54mm Italkit

Pneumatic exhaust valve from manufacturer Italkit, for Rotax 122 Ø54mm cylinders (for example Aprilia RS 125).

It works by the pressure of the exhaust gases, opens progressively from 5,000 to 6,000 RPM. To install it on Aprilia motorcycle cylinders (which use a valve operated electronically by cable), you need to drill the base of the valve seat with a 4.5mm drill bit, down to the bottom of the exhaust port. To carry out this operation, you can use the gasket included in the kit as a template. Highly recommended for those looking to improve engine feel and response at low and mid-range.