O.S. Engine 21XZ-B nitro engine

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O.S. Engine 21XZ-B

The new O.S. Engine 21XZ-B offers top-of-the-line power and performance at an unexpectedly low price. The O.S. Engine 21XZ-B offers less weight and a lower center of gravity on one hand, and improved torque and acceleration on the other, making the O.S. Engine 21XZ-B a savvy choice for racing. Other improvements include a stronger crankcase, and the new 21J2 three-needle carburetor that offers improved fuel mileage and a 7 mm restrictor for added fine-tuning finesse.

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