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O.S. Speed B21 Ty Tessmann II Limited Edition Engine (1A209)

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  • O.S. Speed B21 Ty Tessmann II Limited Edition Engine (1A209)


This is the O.S. Engines Speed Tuned B21 Ty Tessmann II Limited Edition 1/8 scale Buggy Engine.

****** Because of the expressed racing nature of this engine, ******
****** it is NOT covered by the O.S. 2 Year Warranty ******


  • 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 crankshaft
  • 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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