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O.S. Speed R21 EURO SPEC COMBO (TR01 + MR02)
O.S. Speed R21 EURO SPEC COMBO (TR01 + MR02)

O.S. Speed R21 EURO SPEC COMBO (TR01 + MR02)

Your Price:$539.00
Retail Price:$969.00
You Save:$430.00(44%)
Out of Stock.
Part Number:1C403

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Engine Option

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  • 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.


Compatible with 16% nitro fuel, which complies with EFRA regulations
Crankshaft features DLC (Diamond Like Coating), and an embedded
tungsten weight
Slide valve carburetor
8.5mm reducer installed in carburetor venturi to reduce amount of
air flow for greater torque
Factory applied two color graphics


O.S. Speed R2103 Engine, 8.5mm Carb Reducer, Inner Head, T-RP7 Plug,
Exhaust Seal Ring, Tapered Collet, three Carb Dust Seal Caps and


Fuel: 10-30% nitro content, 20% recommended for break-in
Glow starter and track equipment


Carburetor Settings;
Needle Valve: Three turns open from fully closed position
Mixture Control Valve: Flush with carburetor body, adjusting range
+/- 1 turn
Metering Needle: Flush with ball link body
Throttle Stop Screw: 0.5mm from side of carburetor body when
viewed from above

Displacement: .213 cu in (3.49 cc)
Bore: 0.633 in (16.08 mm)
Stroke: 0.677 in (17.2 mm)
Practical RPM: 4,000-45,000
Power Output: 2.8 ps/2.76 hp @ 33,000 rpm
Weight: 11.99 oz (340 g)
Crankshaft Size: UNF1/4-28
Distance Between Mounting Holes Same Side: 0.83" (21mm)
Distance Between Mounting Holes Opposite Side: 1.45" (37mm)
Height Bottom of Mounting Tabs/Top of Cylinder Head: 2.9" (75.6mm)
Height Bottom of Mounting Tabs/Center of Exhaust Outlet: 1.1" (28mm)
Width of Mounting Tabs: 1.8" (45mm)
Distance from Backplate to Front Bearing: 2.5" (64.5mm)
Distance from Center of Crankcase to Front Bearing: 1.7" (44mm)
Distance from Center of Crankshaft to Backplate: 0.81" (20.5mm)

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