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O.S. Speed 21ZX-B Spec II Ty Tessman 110% Engine
O.S. Speed 21ZX-B Spec II Ty Tessman 110% Engine

O.S. Speed 21ZX-B Spec II Ty Tessman 110% Engine

Your Price:$459.99
Retail Price:$499.99
You Save:$40.00(8%)
Out of Stock.
Part Number:1217D

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0.16" (4mm) lower cooling head lowers center of gravity for improved
21J3(B) slide valve carburetor with 7mm carb reducer that restricts
airflow helping to increase the amount of torque produced


21XZ-B Spec II Ty Tessmann Edition 110% Long Stroke Glow Engine with
Exhaust Gasket, P3 Turbo Ultra Hot Glow Plug, 7mm Carb Reducer,
Decal Sheet, two Dust Caps and Instruction Manual


Glow Fuel: 10-30% nitro content, 20% recommended for break-in
Tuned pipe such as the O.S Engines T-2090SC
Glow Starter and Track Equipment


Displacement: 0.213 cu in (3.49 cc)
Bore: 0.641" (16.27mm)
Stroke: 0.661" (16.8mm)
Practical RPM: 4,000 - 42,000
Weight: 12.45oz (353g) engine only
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:
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 very small adjustments
Needle Valve: Approximately 3 turns open from fully closed
Throttle: Approximately 0.5mm open from factory setting with
reducer removed
Metering Needle: Flush with ball link body
Mixture Control Valve: Rotate until slotted head is flush with
carb body

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Engine Pre Broken in Service
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