O.S. Engine 21XR-B .21 Nitro Engine

O.S. Engines has an affordable new .21 8th scale buggy race engine called the XR-B. The XR-B was designed to put out good power at a reasonable price point, yet can be upgraded as yours skills improve. Some of its features and specifications include- * A blue-anodized aluminum head keeps the engine cool under harsh conditions * Simple, adjustable carb features easy [...]

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