- Developed for high-speed tracks, which require more top speed.
- The piston and liner are newly designed.
- Two holes in the piston contribute to reducing weight.
- The liner is newly designed to increase top speed.
O.S. SPEED boasts the engine high performance series "R21" for ON ROAD, and one new engine of interest is added to the line-up. This O.S. SPEED R21 EURO Spec. Combo Set is an engine compatible with the high-speed course which thoroughly pursued the growth of the top speed by changing the port timing of the crankshaft and the cylinder/piston.
"EURO Spec" dedicated cylinder/piston is adopted. In addition, a dedicated design outer head is also equipped.
"T-2080 SC tuned silencer" and "M2001SC exhaust manifold" are also included in this combo set.
- Stroke volume:
- 3.49 cc / 0.213 cu.in.
- 16.08 mm / 0.633 in.
- 17.20 mm / 0.677 in.
- 2.8 ps / 2.76 hp / 33,000 r.p.m.
- Practical rotation speed:
- 4,000 - 45,000 r.p.m.
- 340 g / 11.99 oz