O.S. Engine OS-1A203 Speed B2101-TY Race-Tuned Engine with T2090-TY Silencer  [OS-1A203]

O.S. Engine OS-1A203 - O.S. Speed B2101-TY w/T2090-TY Header and Silencer
Price:
NZD$927.24
Brand:
O.S. Engine
Model:
OS-1A203
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Racing Focus for the O.S. Engine OS-1A203 Speed B2101-TY Package

Targeted at drivers who chase consistent lap times, the O.S. Engine OS-1A203 paired with the Speed B2101-TY and the T2090-TY silencer offers controlled power delivery and accurate throttle feel. The set is suited to tuned buggies where predictable midrange is key.

Performance Numbers and Build Quality

The Speed B2101-TY features a 3.46cc displacement and a peak output of 2.61hp at 34,000 RPM, with a usable band from 4,000 to 42,000 RPM. Precision-machined crank components and engraved detailing indicate careful manufacturing that helps reduce vibration and improve reliability.

Purpose-Built Parts and the 5.8mm Restrictor

Included in this limited run is a purpose-built 5.8mm carb restrictor, developed for Ty Tessmann's championship configuration to refine air intake and improve torque at lower engine speeds. The T2090-TY muffler teamed with the M2002SC manifold enhances low to mid-range acceleration for tighter race lines.

Specifications

  • Displacement: 0.211 cu in (3.46cc)
  • Bore: 0.646" (16.4mm)
  • Stroke: 0.646" (16.4mm)
  • Practical RPM: 4,000-42,000 RPM
  • Output: 2.61hp @ 34,000RPM
  • Weight: 12.42oz (352g)
  • Mounting Hole Centers (Same Side): 0.83" (21mm)
  • 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)
  • Crankshaft Size: UNF1/4-28
  • Crankshaft Length: 1.2" (29.5mm) outside of engine
  • Carburetor Settings: Preset at factory, minimal adjustments needed

For off-road racers who value a strong, driveable midrange, the O.S. Engine OS-1A203 Speed B2101-TY with T2090-TY is a practical choice that reduces setup complexity while delivering competitive performance.

How should I break in the Speed B2101-TY engine?

Run several gentle laps at varying throttle to bed parts in, then perform a controlled high-rpm pull; keep the carb richer than final tune until temperatures stabilise.

Is the 5.8mm restrictor removable for testing other setups?

You can test alternative restrictor sizes, but expect notable shifts in torque and top end. Any change requires retuning of the needles and checking engine temps.

Will the supplied manifold fit my existing chassis?

The M2002SC manifold is compatible with common 1/8 scale mounting patterns, but confirm clearance and header alignment before final installation.

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