Manufacturing Timeline Gallery | Product Manuals | Engine Specs | Exploded Views | Download Brochures The First Choice for Quality, Durability and Performance First to introduce a mass-produced 4-stroke engine, an innovator in every phase of R/C engine production, O.S. also retains a tradition of craftsmanship that pays off in durability and power. Each new engine is the product of over two years of testing and design™and more than two generations of R/C engine experience.

				O.S. Racing Team Race Videos						Installing a Cooling Fan/Clutch