O.S. Engines

21XZ-R VII On-Road Engine

With the O.S. 21XZ-R VII On-Road Engine there's no need to choose between power and fuel economy – it offers the best of both! The easy-starting 21XZ-R VII lets you unleash its race-winning potential right out of the box.
Displacement: 0.212 cu in (3.49 cc), Output:2.79 hp @ 33,000 rpm, RPM Range: 4,000-45,000, Bore: 0.640 in (16.27 mm), Stroke: 0.661 (16.8 mm), Weight: 12.1 oz (343 g)

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