Slats of BOYESEN 125cc motorcycle competition valves engine 4FU YAMAHA DT, TDR & TZR 125cc, VR 150cc, SUZUKI SDR 200cc ...

Here are the famous BOYENSEN competition valves. These valves are made for the 4FU engine which equips 125cc 2-stroke machines DERBI GPR, YAMAHA TDR, DT, DTX, DTRE, YAMAHA TZR and many others. These blades are also mounted on SUZUKI SDR 200cc, KTM LC2 / STING 125 2T, SACHS XTC / ZX 125 2T ... or even YAMAHA VR 150cc . To be used with original louvre stops, cut or uncut!

It will allow an increase in power but also in torque! It is a patented system with double strips, a thinner one for low revs and a thicker one that comes into action (resonance) for high revs! The fiberglass that designs them is of very high quality! Ideal for equipping your unbridled and highly equipped machines. They are delivered with a notice!