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Always careful to the evolution of the 2-stroke 50cc Supermotard and off-road motorcycles, Polini Motori dedicates to this category of vehicles a new range of expansion chambers with different models developed to be installed on the following motorcycles : Aprilia, Beta, Derbi, Gilera, Rieju, Sherco, Yamaha. Homologated, they perfectly match the shapes of the frame and grant good performance, optimization of the power at every rpm and great reliability. The silencer is made of black anodized aluminum. It can be disassembled to make the repacking easier.