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O.S. SPEED B21 Adam Drake Edition 4 (1FH00)
Latest collaboration engine with world-famous O.S. Team driver Adam Drake. Cylinder liner, crankshaft and outer head have been redesigned to Adam Drake’s spec for better balance, more torque and more power for better driving performance.
Specifications
| Displacement | 3.49 cc / 0.213 cu.in. |
|---|---|
| Bore | 16.4 mm / 0.646 in. |
| Stroke | 16.55 mm / 0.652 in. |
| Output | 2.65 ps / 2.61 hp @ 34,000 rpm |
| Practical RPM range | 4,000–42,000 rpm |
| Engine Weight | 352 g / 12.42 oz |
Standard Accessories
- O.S. SPEED P3 glow plug
- Reducer φ6 II (blue) AL2 & Reducer φ8 mm (blue) AL
- Exhaust seal ring
- Dust cap set 3mm / 16mm / 18mm
Key Features
Advice & testing by Adam Drake
Newly designed 3-port cylinder liner – Changing the exhaust dimension for more torque.
Improved crankshaft inner diameter – Better response in low to mid-range.
Outer head: double anodised black & blue with new laser design – Lighter, better balance.
Inner head’s combustion chamber redesigned – Improved combustion efficiency for more torque.
Includes φ6 II and φ8 blue anodised reducers.
