O.S.Speed B2105 1:8 Offroad engine

Japanese manufacturer O.S.Speed has announced the latest evolution of its World Championship winning 1:8 Offroad engine with the release of the B2105.  The fifth generation of the B21 series, it is designed to produce power that gives an advantage in harsh offroad racing scenes, and pursues a driving feel that steadily demonstrates performance in any situation.  By re-designing the cylinder liner and crankshaft, they have achieved smooth and linear power delivery.  The newly designed 3 port cylinder and liner features new port shape and the air-fuel mixture flow has been reviewed to achieve more torque from mid to high end.  The modified crankshaft has undergone O.S.Speed’s traditional DLC coating and the internal shape has been revised to improve not only power characteristics but also easier to use than B2104.  Additionally, the effect of a lighter outer head successfully improves drivability of the B2105.

Spec.
Displacement： 3.49 cc / 0.213cu.in.
Bore: 16.27mm / 0.641 in.
Stroke: 16.80mm / 0.661 in.
Output :2.68 ps / 2.64 hp / 34,000 r.p.m.
practical rpm range: 4,000-42,000 r.p.m.
Engine Weight:348g / 12.28 oz.

Standard accessories
Glow plug T-P3
Reducer φ6Ⅱ、φ6.5Ⅱ
Exhaust seal ring
Dust cap set 12-30(φ3、φ16、φ18)

Source: O.S. Engines [os-engines.co.jp]