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O.S. Speed R2105 Engine

Item No. OSMG2028
Brand Logo
4.5 out of 5 Customer Rating

O.S. Speed R2105 Engine

Item No. OSMG2028
$679.99
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Product Details

The O.S. SPEED R21 series won the previous World Championships held in the United States. The "R2105", most of the parts has been newly designed, aiming for consecutive victories at the world championship to be held in Japan this year.
Key Features
  • 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
icon-box
In The Box
  • (1) O.S. Speed R2105 Engine
  • (1) Reducer (8.5mm RED)
  • (1) T-RP7 Glow Plug
  • (1) Exhaust Seal Ring
  • (3) Dust Caps (3mm, 16mm, 18mm)

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.

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 Specifications

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