103 AIR (ref: 197248)

The S1R aluminium cylinder is equipped with a 5-transfer scavenging booster exhaust ports. Aluminium provides better heat release and it is nikasil-coated. In consequence, we get a low-coefficient friction surface and a great resistance. Solid chromed steel two-ring elliptical piston. DOPPLER recommends to associate its cylinder with the DOPPLER cylinder head.