O.S. Speed – B21 Ronda Drake Edition w/ T-2100SC + MB01-75 Combo Set



In addition to the O.S. SPEED B21 Adam Drake edition 2, we are proudly releasing O.S. SPEED B21 Ronda Drake Edition Combo Set featuring a pink cooling head and pink carburetor restrictors, which are her image color. Ronda Drake is the wife of Adam Drake, and she is also a racer. Now we have two different colors in the same specifications; bore x stroke 16.4 x 16.55mm, the double-counter weight embedded crankshaft with DLC hard coating, a ceramic rear ball bearing, an o-ringed inner head, and an easy adjustable ball link.


  • A pink cooling head and pink carburetor restrictors.
  • Bore x stroke 16.4 x 16.55mm, which is the maximum in the IFMAR regulation.
  • A double-tungsten counter weight crankshaft with DLC hard coating and silicon filler.
  • An o-ringed inner head, which absorbs vibration and prevents dust coming into the combustion chamber.
  • 6.5mm and 7.0mm carburetor restrictors.
Output2.65 ps – 34,000 r.p.m.
Practical RPM Range4,000-42,000 r.p.m.