The OS FR7-420 (Sirius 7) is a seven-cylinder radial overhead-valve fourstoke-cycle engine of 70cc displacement. The engine maintains the same features of stress free starting, super smooth idling and high torque power which is always the hallmark of OS large size multi-cylinder engines. With its finely detailed design and outstanding scale appearance and sound, the engine's quality is second to none.
Displacement: | 9.95 cc x 7 / 0.607 c.u.in. x 7 |
Bore: | 24.0 mm / 0.945 in. |
Stroke: | 22.0 mm / 0.866 in. |
Practical R.P.M: | 1500-7000 r.p.m |
Weight: | 3167 g / 111.71 oz. |
Weight: | 5.1000 |