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O.S. 21XR-B Version II Off-Road Competition Buggy Engine

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The O.S. 21XR-B Version II Off-Road Competition Buggy Engine gives you the advantages of a competition grade power plant, with a sport engine price. This version of the 21XR-B power plant has been totally re-designed to be even more reliable with the 21J3-I carb for easy tune characteristics. The aluminum cooling head ensures steady power even under harsh conditions. When you're ready to move up to top competition, the engine is compatible with high-performance O.S. Speed 21XZ-B parts, letting the engine reach its full potential.

  • Engineered for up-and-coming 1/8 scale buggy club racers, with upgrade capability for competing at the highest levels.
  • A dependable, low-maintenance engine that fits into most any modeler's budget.
  • O.S. Speed parts are available for updating the outer and inner heads, crankcase, crankshaft and more.
0.211 cu in (3.46 cc)
Bore: .641 in (16.27 mm)
Stroke: .661 in (16.8 mm)
Practical RPM: 4,000-40,000
Power Output @ 33,000 rpm: 2.45 ps/2.42 hp
Weight: 13.40 oz (380 g)
Includes: P3 turbo plug

This product was added to our catalog on September 19, 2017