O.S. Engine 21XZ-B

Mar 01, 2013 No Comments by

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.

Featured News, Nitro

About the author

Bringing you RC product news you can use on a daily basis as Car Action's Online News Editor. I have been heavily involved in RC since the late 90's, plus a diverse background that includes print and broadcast journalism, engineering, information technology, direct marketing, and even banking. Currently I enjoy racing 1/10 electric off-road, covering large race events, and spending time with my family when away from the track.
No Responses to “O.S. Engine 21XZ-B”
Copyright © Air Age Media. All rights reserved.
click me