Speed R2101 Competition On-Road Engine by O.S.

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Frederick, MD

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Low Price: $499.99
Discontinued Online

This product was added to our catalog on April 22, 2016.

The O.S. Speed R2101 Competition On-Road Engine takes the winning heritage of the 21XZ-R and combine it with the 21XZ-B's superb features to create a top choice for 1/8 scale on-road!

With a specially designed 7+3 port cylinder liner, the R2101 delivers stress-free acceleration, great power at maximum rpm and improved fuel economy. The DLC coated crankshaft has tungsten weights and is silicone ramped, while the crankcase provides efficient fuel flow from intake to exhaust. With laser-etched Speed Tuned graphics, the Speed R2101's machined head provides improved cooling and a lower center-of-gravity. Finally, a black-anodized 21M2(B) carburetor allows operation with richer fuel mixtures.

Displacement: 0.213 cu in (3.49 cc)
Bore: 0.633 in (16.08 mm)
Stroke: 0.677 in (17.2 mm)
Practical RPM range: 4,000-45,000
Output: 2.7 hp @ 33,000 rpm
Weight: 11.99 oz (340 g)
Requires: Glow fuel, T-2080SC Tuned Silencer Set


  • 21M2(B) carburetor
  • RP7 Turbo glow plug
  • 8.5 mm carb restrictor
  • exhaust seal ring and taper collet