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.

• 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

SPECIFICATIONS
Stock Number: OSMG1307
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)
37010 FR7-420 Sirius Parts Listing

Click here to see 2-view drawing.

V-shaped valve layout matches various scale model airplanes.

Main internal parts such as crankshaft, wrist pin, cam holder and reduction gear are all plated for anti-corrosion. Selected material and proper thermal treatment ensure high durability of the parts.

The impeller distributes balanced air-fuel mixture to each cylinder, which has realized long lasting stable idling.