O.S. Speed R2103 w/T-2080SC Pipe Set Engine

Tower Stock# OSMG2021  •  Manufacturer Stock# 1AY01
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Notes from our tech department:
This is the O.S. Speed .21 R2103 Engine for On-Road 18 scale Racing.
with the T-2080SC Silencer Set.
Replaces the O.S. Speed R2102.

****** Because of the expressed racing nature of this engine, ******
****** it is NOT covered by the O.S. 2 Year Warranty ******


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
Aluminum silencer with polished natural finish


O.S. Speed R2103 Engine, 8.5mm Carb Reducer, Inner Head, T-RP7 Plug,
Exhaust Seal Ring, Tapered Collet, three Carb Dust Seal Caps,
Instructions and T-2080SC Silencer Set


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 ps2.76 hp 33,000 rpm
Weight: 11.99 oz (340 g)
Crankshaft Size: UNF14-28
Distance Between Mounting Holes Same Side: 0.83 (21mm)
Distance Between Mounting Holes Opposite Side: 1.45 (37mm)
Height Bottom of Mounting TabsTop of Cylinder Head: 2.9 (75.6mm)
Height Bottom of Mounting TabsCenter 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)

jxs 122717



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