Boyesen kit reed valve for Yamaha YZ 250 05-22

BOYESEN reed valves kit are composed of a single aluminum body, machined with the latest generation CNC machinery.
The monobloc structure allows to obtain a much more homogeneous flow in the aspiration stage, which is then directed much more directly into the combustion chamber. The aluminum body also keeps the incoming mixture fresh.
These features, together with the Boyesen Pro Series reeds optimized specifically for each engine, guarantee improvements over the entire delivery curve and lightning-fast throttle response.
The reed valves kit are supplied complete with everything necessary for installation and it is not necessary to make any modifications to the engine.

Boyesen reed valves kit are developed in collaboration with the best teams in the world such as Yamaha Factory, Pro Circuit, Kawasaki Factory Europe, KTM Factory and some of the best riders ever such as Jeremy McGrath.