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O.S. SPEED B21 Ronda Drake Pink Edition


O.S.SPEED B21 Ronda Drake (Pink) Edition 3.5cc Buggy Engine

In addition to the O.S.SPEED B21 Adam Drake edition 2, we are proudly releasing O.S.SPEED B21 Ronda Drake edition 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.


Displacement: 3.49cc

Bore: 16.4mm

Stroke: 16.55mm

Output: 2.61 hp @ 34.000RPM

Practical RPM Range: 4.000-42.000

Weight: 362g


SPEED B21 Adam Drake Edition 2 - Off-Road Racing Engine

O.S.SPEED B21 ADAM DRAKE EDITION 2 is an evolution of the previous Adam Drake model that was born with the advice of world-class pro-racer Adam Drake from USA.


The Bore/Stroke ratio of the Drake-spec engines is 16.4x16.55mm and are unique to this engine (and it’s processor).

Newly designed crankshaft for further improved driving feeling (different tungsten balancing).

New updated combustion chamber that use an additional O-ring which reduce vibration and seals out most of the dirt that can accumulate around the sleevsd upper/outer edge.

The new carburetor also has its locking screw turned around 90 degrees so its much easier to reach/tighten.

Two carburetor venturi inserts are included: 6.5 & 7.0 mm

Also available as a combo set including an exhaust system


Stroke volume: 3.49 cc

Bore: 16.4 mm

Stroke: 16.55 mm

Output: 2.61 hp @ 34.000RPM

Practical RPM Range: 4.000 - 42.000

Weight: 353 g