O.S. Engines would like to introduce new O.S.SPEED B21 ADAM DRAKE 4.

Latest collaboration engine with world famous O.S. Team driver Adam Drake. Cylinder liner, crankshaft,

outer head has been redesigned to Adam Drake’s spec for better balance, more torque and more power for better driving performance.

Spec---------------------------
Displacement： 3.49 cc / 0.213cu.in.
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:352g / 12.42 oz.

Standard accessories---------------------------
O.S. SPEED P3 glow plug
Reducer　6II (blue) AL2・Reducer　8mm (blue) AL
Exhaust seal ring
Dust cap set 3mm/16mm/18mm