O.S. Speed 21XZ-GT 1/8 Scale Touring Class .21 Engine

Tower Stock# OSMG2062  •  Manufacturer Stock# 1AS00
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Notes from our tech department:
This is the O.S. Engines Speed 21XZ-GT 1/8 scale Touring Class Racing Engine.
******Because of the expressed racing nature of this engine,******
******it is NOT covered by the O.S. 2 Year Warranty******


Five scavenger ports and three exhaust ports improve power in the mid
to high range
Crankshaft engineered for GT touring, silicon potted and DLC coated
with tungsten weights pressed in
ROAR legal, slide valve dual adjustable 21J carburetor with 7mm
Outer head features a lower CG and shiny fins


Speed 21XZ-GT 1/8 scale Engine with Turbo P-3 Glow Plug, Exhaust
Seal Ring, two Dust Caps, 7mm Carb Reducer, and Instruction Sheet


Glow Fuel: 10-30% nitro content, 20% recommended for break-in
Manifold and Tuned Pipe
Glow Starter and Track Equipment


Displacement: 0.213 cu in (3.49 cc)
Bore: 0.641 in (16.27 mm)
Stroke: 0.661 in (16.80 mm)
Practical RPM: 4,000-42,000
Power Output: 2.61 hp/2.65 ps @ 34,000 rpm
Weight: 12.45 oz (353 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: 3.2" (81.9mm)
Width at Mounting Tabs: 1.8" (45mm)
Width of Crankcase below Mounting Tabs: 1.2" (31.6mm)
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 Crankcase to Backplate: 0.81" (20.5mm)

Carburetor Settings, NOTE carburetor is preset at factory and
requires only very small adjustments
Needle Valve: Approximately 3.5 turns open from fully closed
Throttle: Approximately 0.5mm open from factory setting with
reducer removed
Metering Needle: Rotate until slotted head is 1.5mm away from ball
link body
Mixture Control Valve: Rotate until slotted head is flush with
carb body

jxs 10/05/16



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