O.S. Speed R2103 Engine

Tower Stock# OSMG2020  •  Manufacturer Stock# 1AY00
Easy Pay
Request 3 Payments ($166.67, $166.66, $166.66) Details
Notes from our tech department:
This is the O.S. Speed .21 R2103 Engine for On-Road 1/8 scale Racing.
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


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


Fuel: 10-30% nitro content, 20% recommended for break-in
Exhaust system depending on vehicle
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)

jxs 12/27/17



Product Documents & Files

Manufacturer Product Web Page

Manufacturer Contact Information