Slats valves BOYESEN motorcycle racing 125cc 2 times YAMAHA RD & LC YPVS SUZUKI RM 250cc 1989 and 1990

Here are the famous valves BOYENSEN competition. These valves are made ​​to the engine powering 125cc machines 2 times YAMAHA RD LC YPVS and many others. These strips will also fit on SUZUKI RM 250cc.

It will allow an increase in power but also the couple! This is a patented double slat system, a thinner for low speeds and a thicker which kicks in (resonance) for high speeds! The fiberglass that is design the highest quality! Ideal to equip your unbridled and highly equipped machines. They come with instructions!