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OS MAX-21XZ-B Ver.iI

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O.S. Engines

 Product Description

OS MAX-21XZ-B Ver.iI


  • Performance that rivals that of the acclaimed Speed 21XZ-B Spec II
  • Shares the same piston, liner and con rod as the Speed version
  • Lightening holes in the cylinder head reduce overall weight
  • Other enhancements include a lower CG and improved cooling
  • A 22B2 single needle carb makes tuning a breeze
  • Optimized power band
  • Silicone filled crankshaft with tungsten counter weights
  • Blue anodized head
  • Incredible throttle response
  • 7mm carb reducer is included

The perfect balance between price and performance.

As competition-level buggy engines go, the 21XZ-B VII is a super value! By making it lighter, lower and cooling running, it exceeds the expectations of even pro racers — delivering power comparable to the Speed Spec II at a lower price. 1/8 scale drivers looking for a performance advantage will find it with the 21XZ-B VII powerhouse.


  • Displacement.213 cu in (3.49 cc)
  • Bore.641 in (16.27 mm)
  • Stroke.661 in (16.8 mm)
  • Practical RPM3,000-41,500Power
  • Output2.7 hp @ 34,000 rpm
  • Weight12.77 oz (362 g)
  • Includes2282 carburetor, 6 mm and 7 mm carb restrictors,
  • P3 glow plug, exhaust seal and dust cap set
Glow fuel, muffler, tuned pipe and manifold

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