O.S.SPEED R21 SHIMO EDITION 3 Combo Set (1FG01) TR03 EFRA2196 & MR05

The O.S. SPEED R21 SHIMO EDITION 3 Combo Set (1FG01) is a high-end .21 on-road nitro racing engine package developed in collaboration with O.S. team driver Takaaki Shimo. It features a tuned 3.49 cc engine with a 9-port cylinder liner and specially treated piston for longer life and smoother power delivery. To improve drivability from low to top end, the combo includes the TR03 EFRA2196 tuned exhaust and MR05 manifold. The carburetor is fitted with a dust cover ring to reduce fuel leakage and stabilize idle performance. Visually, the engine has a striking deep gold head and premium finish, while internal upgrades like a ceramic rear bearing and “R” connecting rod from the R2106 improve reliability and performance for competitive on-road racing.

Specifications

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)