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  • OS Engines O.S. Speed R2105 Engine
  • OS Engines O.S. Speed R2105 Engine
  • OS Engines O.S. Speed R2105 Engine
  • OS Engines O.S. Speed R2105 Engine
  • OS Engines O.S. Speed R2105 Engine
  • OS Engines O.S. Speed R2105 Engine
  • OS Engines O.S. Speed R2105 Engine
  • OS Engines O.S. Speed R2105 Engine
  • OS Engines O.S. Speed R2105 Engine
  • OS Engines O.S. Speed R2105 Engine
  • OS Engines O.S. Speed R2105 Engine
  • OS Engines O.S. Speed R2105 Engine
  • OS Engines O.S. Speed R2105 Engine
  • OS Engines O.S. Speed R2105 Engine

OS Engines O.S. Speed R2105 Engine

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  • Detail

    Introduction

    To increase torque on high-grip track surfaces, a newly designed 9-port sleeve is adopted. O.S. SPEED's traditional DLC coated crankshaft delivers linear power from low to top by changing the counter balance. The outer head has been mirror finish and by clear coat from the conventional color to a silver head base has been adopted. By adopting a thrust plate made out of steel, wear due to interference between the connecting rod and the cover plate during rotation is reduced and engine life is improved.

    Adopting the latest design to most part of the engine, it is finished with content suitable for the flagship of the O.S. SPEED on-road engine.

    • Adopts Newly Designed Ports
    • Redesign Of The Crankshaft’s Counter Weight
    • Polished Finish Is Applied
    • New Mold Adopted For The Crankcase
    • Thrust Plate Made Out Of Steel
    Piston Sleeve
    Piston Sleeve

    To increase torque, the sleeve adopts newly designed ports.

     

    Crankshaft
    Crankshaft

    By redesigning of the crankshaft’s counter weight, power delivery from low to top is improved.

     

    Silver Finish
    Silver Finish

    Polished finish is applied to the silver head base from the conventional color.

     

    New Crankcase Mold
    New Crankcase Mold

    A new mold was adopted for the crankcase, and the O.S. SPEED logo was applied to the exterior design.

     

    Needle O-Ring
    Needle O-Ring

    Based on 21M, which already had a good reputation, by changing the needle O-ring from 1 piece to 2 pieces to prevent the needle adjustment from changing.

     

    Increased Durability
    Increased Durability

    By adopting a thrust plate made out of steel, wear due to friction between the connecting rod and the cover plate during rotation is reduced and engine durability is improved.

     

    Product Specs

    Bore
    0.633" (16 mm)
    Cylinders
    Single
    Displacement
    3.49 cc / 0.213cu.in
    Engine (Only) Weight
    0.76lbs (345g)
    RPM Range
    4,000-45,000 r.p.m
    Stroke
    17.20mm / 0.677 in
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