21XZ-B VII Off-Road Competition Buggy Engine by O.S.

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This is the O.S. 21XZ-B VII Off-Road Competition Buggy Engine. The 21XZ-B VII is light, cool running, with a low CG. Delivering power comparable to the Speed Spec II, the 21XZ-B VII exceeds expectations at a lower price. 1/8 scale drivers looking for a performance advantage will find it with the 21XZ-B VII powerhouse!

  • 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
.213 cu in (3.49 cc)
Bore: .641 in (16.27 mm)
Stroke: .661 in (16.8 mm)
Practical RPM: 3,000-41,500
Power Output: 2.7 hp @ 34,000 rpm
Weight: 12.77 oz (362 g)
Includes: 2282 carburetor, 6mm and 7mm carb restrictors, P3 glow plug, exhaust seal and dust cap set

This product was added to our catalog on July 11, 2014.

Angel Negron
Thursday, May 5 2016 (11 months ago)
O.S. 21XZ-B VII Off-Road Competition Buggy Engine
This engine the best for offroad and onroad for price nice)
Verified Owner
Monday, May 2 2016 (11 months ago)
O.S. 21XZ-B VII Off-Road Competition Buggy Engine
Great engine -- intermediate to pro -- this engine holds a tune and has great power (bottom and high). Pair it with a 2090 pipe. Can't beat the price for OS quality.)