O.S. Engine 21XZ-B

O.S. Engine 21XZ-B

This affordable engine features a blue-anodized aluminum head to keep engine temps down, plus it can be upgraded with 21XZ-B parts for even greater performance gains. Check out all the details in the press release below:

Engineered to deliver maximum performance with minimal effort, the 21XR-B engine is an affordable alternative for the up-and-coming off-roader. Proven O.S. technology ensures steady power. Ideal for any 1/8 scale buggy. Plus, the 21XR-B can be upgraded with many of the 21XZ-B’s parts for greater performance as a driver’s skills increase.


  • A blue-anodized aluminum head keeps the engine cool under harsh conditions
  • Simple, adjustable carb features easy tuning
  • Shares the same basic layout as the ultimate high-performance 21XZ-B engine, and can be upgraded with 21XZ-B parts


Displacement: 0.213 cu in (3.49 cc)
Bore: 0.641 in (16.27 mm)
Stroke: 0.661 in (16.8 mm)
Practical RPM Range: 4,000-40,000
Output: 2.4 hp @ 33,000 rpm
Weight: 13.1 oz (370 g)

OSMG2055 – 21XR-B. – $229.99


If you like this article, check out this additional article on O.S. Engine.

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Updated: February 28, 2013 — 4:15 PM
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