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  • OS Engines O.S.SPEED B2105
  • OS Engines O.S.SPEED B2105
  • OS Engines O.S.SPEED B2105
  • OS Engines O.S.SPEED B2105
  • OS Engines O.S.SPEED B2105
  • OS Engines O.S.SPEED B2105
  • OS Engines O.S.SPEED B2105
  • OS Engines O.S.SPEED B2105
  • OS Engines O.S.SPEED B2105
  • OS Engines O.S.SPEED B2105
  • OS Engines O.S.SPEED B2105
  • OS Engines O.S.SPEED B2105
  • OS Engines O.S.SPEED B2105

OS Engines O.S.SPEED B2105

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  • Detail

    Overview

    The B2105, which has evolved into the fifth generation of the B21 series, is designed to secure power that gives an advantage in harsh off-road racing scenes, and pursues a driving feel that steadily demonstrates performance in any situation. By re-designing the cylinder liner and crankshaft, we have achieved smooth and linear power delivery. Furthermore, the effect of a lighter outer head successfully improves drivability in any situation.

    Cylinder
    Cylinder

    The newly designed cylinder and liner applies 3 ports. The port shape has been changed and the air-fuel mixture flow has been reviewed to achieve more torque from mid to high end.

    Crankshaft
    Crankshaft

    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.

    Outer Head
    Outer Head

    Drivability is improved by reducing the weight of the outer head.

    Bearings
    Bearings

    Inherited from the well-established B2104 crankcase. The bearing inside the case also uses a proven ceramic bearing.

    Thrust Plate
    Thrust Plate

    By adopting a specially treated thrust plate for the cover plate adopted from B2104, wear caused by friction between the rotating connecting rod and the cover plate is reduced and engine life is impiroved.

    Product Specs

    Bore
    0.641" (16 mm)
    Displacement
    3.49 cc / 0.213cu.in.
    Engine (Only) Weight
    12.28lbs (5570g)
    Manufacturer #
    1EK00
    Plug Type
    T-P3
    RPM Range
    4,000-42,000 r.p.m.
    Stroke
    0.661" (16.80mm)
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