O.S. Engines would like to introduce all new O.S. SPEED R21 SHIMO EDITION 3. Latest collaboration engine with O.S. Team driver Takaaki Shimo.

On exhaust section on crank case, using spacer(s) that is provided, the engine will perform more linear from low to top end. Cylinder liner is now 9 port with new treatment of piston for longer life of the engine. The carburetor, to avoid fuel leakage and air in the line, it uses “Dust cover ring” to make the idle better and stable.

Exterior of engine uses deep gold outer head, venturi to create all new look.

To maximize the performance, combo set comes with TR03 EFRA2196 + MR05.

Spec---------------------------

Displacement： 3.49 cc / 0.213cu.in.

Bore: 16.08mm / 0.633 in.

Stroke: 17.20mm / 0.677 in.

Output :2.80 ps / 2.76 hp / 35,000 r.p.m.

practical rpm range: 4,000-45,000 r.p.m.

Engine Weight:347g / 12.24 oz.

Standard accessories---------------------------

Glow plug T-RP7

Reducer φ8.5

Exhaust seal ring

Dust cap set 12-30(φ3、φ16、φ18)