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91SZ-H Ring |
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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. |
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| Engine Guide | |
O.S. Racing Team Race Videos |
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Installing a Cooling Fan/Clutch |
