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5 out of 5 Customer Rating

O.S. Speed R2103 Engine

Item No. OSMG2020
Brand Logo
5 out of 5 Customer Rating

O.S. Speed R2103 Engine

Item No. OSMG2020
$499.99 Price reduced from $799.99 to
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Product Details

The next generation of performance.

The next generation of on-road performance has arrived with the Speed R2103 from O.S.! Capable of a wider range of torque than the R2102, the Speed R2103 dominates even on high-grip surfaces. Superior fuel consumption ensures you get the most mileage from every fill-up. Factory-applied two-color graphics add signature style to this sleek-looking power plant.
  • Compatible with 16% nitro fuel, which complies with EFRA regulations.
  • Crankshaft with Diamond-Like Coating (DLC) and an embedded tungsten weight.
  • Outer head with factory-applied two-color graphics.
  • Second inner button head allows for finer tuning to meet track conditions.
  • Steel rear ball bearing.
  • Slide valve carburetor.
  • 8.5 mm reducer installed in the carburetor venturi to reduce the amount of airflow for greater torque.
  • Turbo RP7 glow plug.
  • Includes exhaust seal ring, tapered collet and three carb dust seal caps.

Product Specifications


Bore 0.63 in (16.1 mm)
Carb Type O.S. 21M2(B) slide valve w/8.5mm reducer
Crankshaft Threads UNF1/4-28
Cylinders Single
Displacement 0.213 cu in (3.49 cc)
Power Type Glow
HP 2.8 PS, 2.76 HP @ 33,000 rpm
Plug Type T-RP7 Turbo Glow Plug
Product Height 3.58 in (91 mm)
Product Length 3.70 in (94 mm)
Product Width 1.77 in (45 mm) between mounting tabs
Recommended Fuel 10-30% nitro content fuel
RPM Range 4,000 - 45,000 rpm
Stroke 0.68 in (17.2 mm)
Total Weight 12.0 oz (340 g)