Speed B2101 Off-Road Competition Buggy Engine (Turbo Plug) by O.S.

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This is the O.S. Speed B2101 Off-Road Competition Buggy Engine. The B2101 was developed to fill a hole in the O.S. engine line with an engine that produces a smooth power band, ideal for slick or blown out tracks. It's square 16.4mm bore/stroke dimensions, combined with a DLC coated and balanced OSSPEED tuned crankshaft create the perfect blend of power and driveability. Other features include a low slung, low CG cooling head that hangs below the engine case, for improved handling, and the renown 21J carburetor for easy tuning adjustments. Additionally, 6 and 6.5mm carburetor venturi's are included to tune the engine for various track conditions.


  • Machined low center-of-gravity cooling head
  • Reliable 21J carburetor
  • Square 16.4mm bore/stroke dimensions
  • Smooth power band
  • DLC coated and balanced OS SPEED tuned crankshaft

Displacement: 3.46cc
Output: 2.61ps @ 34,000 rpm
Bore: 16.4mm
Stroke: 16.4mm
Practical RPM Range: 4,000 ~ 42,000 rpm
Weight: 352g


  • T-P4 plug
  • 6mm & 6.5mm Venturi's
  • Exhaust Gasket
  • Dust Cap Set (3mm/16mm/18mm)

This product was added to our catalog on January 8, 2015.

tj saunders
Wednesday, Jul 1 2015 (about a year ago)
O.S. Speed B2101 Off-Road Competition Buggy Engine (Turbo Plug)
This is a great buggy engine with tons of speed and extra speed, I have found that I like the 2060 pipe the best with this engine lots of top end yet enough power for a triple when needed.)