O.S. FR7-420 4-Stroke Engine
The brightest star in 4-stroke appearance and performance!
The "Golden Era" looks of the FR7-420 Sirius are matched by its superb power output and rich, realistic sound.
Specifications:Displacement: 0.6071 cu in x 7 (9.95 cc x 7) Bore: 0.944 in (24.0 mm) Stroke: 0.866 in (22.0 mm) Practical rpm: 1,500-7,000 Weight: 111.7 oz (3.167 g) Includes: 7 type F glow plugs, valve adjusting kit, radial mount & hardware kit, needle valve extension cable, glow plug cable set and aluminum case Recommended props: 22x10, 22x11, 22x12, 23x8, 23x9, 23x10, 23x11, 23x12, 24x8, 24x9, 24x10, 24x11, 24x12, 26x8
- The vintage 7-cylinder design is a scale airplane modeler's dream
- Individual V-shaped valve covers add to the scale appearance, and make this engine compatible with several airplane styles
- Main internal parts such as the crankshaft, cam holder and reduction gear are all plated to resist corrosion
- Air-fuel mixture is distributed equally to each cylinder to ensure stable, long-lasting idle