O.S. R2101 8S low-profile cooling head

O.S. Engine introduce the 8S low-profile cooling head for the R2101 on-road engine. Being of a shorter design with only 8 ribs the cooling head makes for faster engine heat-up and less temperature loss at speed in cold ambient temperatures. The part is a direct replacement for the engine’s stock cooling head.

Source: O.S. Engine [os-engines.co.jp]