Tag Archives: os engines

O.S. engineers have taken superior Speed Spec performance to the next level! In addition to smoother acceleration from idle to full throttle, the 12XZ Speed Spec III also has increased low-to mid-range torque. Drivers will …

Stay a lap ahead of the competition with the 12TG VII engine from O.S.! Featuring a two-piece head and a 12FB slide-valve carb, the 12TG VII boasts the ROAR-legal rear exhaust design and delivers almost …