O.S. Speed R21 Shimo Edition 3 .21 Nitro Engine – 1/8 On-Road Racing
From
$579.00
The O.S. Speed R21 Shimo Edition 3 Engine, item #1FG01, is a factory-developed .21 nitro engine built for competitive 1/8-scale on-road racing. Created in collaboration with O.S. Team driver Takaaki Shimo, this engine is designed to deliver smooth, linear power from low RPM through top end.
The R21 Shimo Edition 3 features spacer technology on the exhaust side of the crankcase to help create a more controllable throttle response across the full powerband. Its 9-port cylinder liner and updated piston treatment are designed to improve performance and extend engine life during demanding race use.
The carburetor also includes a dust cover ring to help reduce fuel leakage and prevent air from entering the fuel line, supporting a more stable and consistent idle. For racers looking for premium O.S. Speed on-road performance, the R21 Shimo Edition 3 is a strong choice for high-level competition.
Key features
- Genuine O.S. Speed R21 Shimo Edition 3 Engine
- O.S. item number: 1FG01
- Developed with O.S. Team driver Takaaki Shimo
- Designed for 1/8-scale on-road nitro racing
- Exhaust-side crankcase spacer design for linear throttle response
- 9-port cylinder liner
- Updated piston treatment for improved engine life
- Carburetor dust cover ring helps reduce fuel leakage and air entry
- Stable idle and consistent tuning behavior
- Built for competitive on-road racing performance
Includes:
-Glow plug T-RP7
-Reducer φ8.5
-Exhaust seal ring
-Dust cap set 12-30 3mm/16mm/18mm
Combo set includes:
TR03 EFRA2196 & MR05
| Displacement | 3.49 cc / 0.213cu.in. |
|---|---|
| Bore | 16.08mm / 0.633 in. |
| Stroke | 17.20mm / 0.677 in. |
| Output | 2.8 ps / 2.76 hp / 35,000 r.p.m. |
| Practical RPM range | 4,000-45,000 r.p.m. |
| Engine Weight | 347g / 12.24oz. |
Free ground shipping.
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