O.S. Engine 21XZ-B Speed Spec II Gold Edition Engine

O.S. Engine 21XZ-B Speed Spec II Gold Edition Engine

From O.S. Engine:

The 21XZ-B Speed Spec II has set the gold standard of 1/8 scale racing engines. Now, it’s available in a special Gold Edition to commemorate O.S.’s 80th anniversary. A gleaming gold cylinder head and carb insert makes it extra-attractive for collectors, while the legendary O.S. performance makes it a must for high-octane racing! View details at: osengines.com.


  • A lighter crankshaft, with DLC coating, tungsten weighting and silicone-filled intake passage
  • Modified piston and con rod that reduces overall weight
  • Outer head with V-shaped fins for lower CG and more efficient cooling
  • Dual-adjustable 21J carburetor for smooth acceleration and better fuel mileage
  • Available with or without the T2090SC pipe set


Displacement: 0.213 cu in (3.49 cc)
Output: 2.61 hp @ 34000 rpm
RPM Range: 4000-42000
Bore: 0.641 in (16.27 mm)
Stroke: 0.661 in (16.8 mm)
Weight: 12.52 oz (355 g)
Includes: 21J carburetor, 6 mm and 7 mm carb restrictors, P3 glow
plug, exhaust seal and dust cap set
Requires: glow fuel
OSMG2047 Also Requires: tune pipe set

OSMG2046 – 21XZ-B Speed Spec II w/T2090SC Pipe – $499.99
OSMG2047 – 21XZ-B Speed Spec II – $399.99
Visit O.S.Engines.com
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O.S. Engine 21XZ-B Speed Spec II Gold Edition Engine

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Updated: August 3, 2016 — 10:38 AM
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