O.S. SPEED B21 Adam Drake Edition 3
O.S. Engines has introduced its newest offroad engine with the release of the O.S. SPEED B21 Adam Drake Edition 3. The engine is the latest offering from the Japanese company’s collaboration with Offroad racing legend Adam Drake. By adopting a boost bypass processing for the crankcase, the engine runs more smoothly, and making it even easier to drive. Adam Drake’s signature colour, blue anodized aluminium is applied to the cutting part of the new outer head, and two-colour anodized aluminium with new design is used to reduce weight and lower the center of gravity for improved driving performance. You can make a choice of two different carburettor restrictor, 6.5II for buggy and 7.5 mainly for truggy.
Displacement： 3.49cc / 0.213 cu.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: 350g / 12.35oz
Source: O.S. Speed [os-engines.co.jp]