Discount applied at checkout🔥

O.S. Speed B21 Ronda Drake Pink Edition 2 (Engine Only)

  • Sale
  • $559.00
  • Regular price $599.00


The O.S. SPEED B21 Ronda Drake Edition 2 is an improved version of the previous model, which was developed in collaboration with O.S. international team driver ADAM DRAKE, who is famous for his deep knowledge and sound technical advice.


  • Based on the B21 Adam Drake (same specifications as the Adam Drake 3 .21 Buggy Engine)
  • By adopting a boost bypass processing for the crankcase, the engine runs more smoothly
  • Ronda Drake's image colour, pink anodized aluminium is applied to the cooling head, and carburettor restrictor
  • New design is used to reduce weight and lower the centre of gravity and improve driving performance
  • By adopting a cover plate with a built-in thrust plate, wear due to interference between the connecting rod and the cover plate during rotation is reduced and engine life is improved
  • The inner head uses an O-ring to reduce vibration and improve dust resistance


  • Displacement: 3.49cc / 0.213
  • Bore: 16.4mm / 0.646 in.
  • Stroke: 16.55mm / 0.652 in.
  • Output: 2.65 ps / 2.61 hp / 34,000 r.p.m.
  • Practical RPM range: 4,000-42,000 r.p.m.
  • Engine Weight: 350g / 12.35oz1