O.S. Speed 21XZ-B Spec III 1/8 Scale .21 Buggy Engine

Tower Stock# LXGDBY  •  Manufacturer Stock# 1AN00
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Notes from our tech department:
This is the O.S. Engines Speed 21XZ-B Spec III 1/8 scale Buggy Racing Engine.
******Because of the expressed racing nature of this engine,******
******it is NOT covered by the O.S. 2 Year Warranty******


Enhanced low-to middle-range torque provides an advantage on tracks
that requires lots of power
Newly developed cylinder liner with three scavenger ports and three
exhaust ports that functions with crankcase to deliver more power
with less fuel consumption
Silicon-potted, DLC-coated crankshaft with pressed-in tungsten
Easy-to-tune 21J slide valve carburetor with 6.5mm restrictor
Lighter drop-in type outer head with a lower center of gravity


Speed 21XZ-B Spec III 1/8 scale Engine with Turbo P-3 Glow Plug
Exhaust Seal Ring, two Dust Caps, 6mm, 6.5mm Carb Reducers,
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: 3.4" (86.5mm)
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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