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O.S. Speed B21 Ty Tessmann II Limited Edition Engine
O.S. Speed B21 Ty Tessmann II Limited Edition Engine

O.S. Speed B21 Ty Tessmann II Limited Edition Engine

Your Price:$459.99
Retail Price:$499.99
You Save:$40.00(8%)
Part Number:1A209

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Related Items

  • Special low-profile cylinder head with double-height vertical fins, designed by Ty Tessmann.
  • Crankshaft cylinder head and crankcase feature a laser-etched engraving of Ty Tessmann's signature.
  • 5.8 mm carb reducer.
  • 21J3 (B) slide valve carburetor.
  • P3 Turbo glow plug.
  • Exhaust seal ring.
  • Dust cap set.

Special 5.8mm carb restrictor supplied by O.S. to Ty for extending
run time in competition

Low profile cylinder head with new shape and double height vertical
fins compared to latest model of the B2102
Ty Tessmann's name is etched into the cylinder head, crankcase and
Silicone filled crankshaft with DLC (diamond like coating) with
balanced tungsten weights and optimal intake timing
slide valve carburetor


Speed Tuned B21 1/8 scale Ty Tessmann II Edition Buggy Engine
Carburetor with 5.8mm Carb Reducer

P3 Turbo Glow Plug
3mm, 16mm and 18mm Dust Caps
Exhaust Seal Ring
Instruction manual


Glow Fuel: 10-30% nitro content, 20% recommended for break-in
Exhaust System


Displacement: 0.211 cu in (3.49cc)
Bore: 0.646" (16.4mm)
Stroke: 0.646" (16.4mm)
Practical RPM: 4,000-42,000 RPM
Output: 2.65ps 2.61hp @ 34,000RPM
Weight: 12.59oz (356g)
Distance Between Mounting Hole Centers Same Side: 0.83" (21mm)
Distance Between Mounting Holes Opposite Side: 1.4" (37mm)
Height Bottom of Mounting Tabs/Top of Cylinder Head: 3.2" (82.6mm)
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 Crankcase to Backplate: 0.81" (20.5mm)
Crankshaft Size: UNF1/4-28
Crankshaft Length: 1.2" (29.5mm) front front bearing
Carburetor Settings: NOTE carburetor is preset at factory and
requires only very small adjustments
Needle Valve, 3-1/4 open from fully closed
Mixture Control Valve, Flush with carburetor body
Metering Needle, Flush with ball link body
Throttle Stop Screw, Approximately 0.5mm

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Engine Pre Broken in Service
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