MOTOR OS FR7-420 7 CYLIND SIRIUS-7 37010

FR7-420 4-STROKE ENGINE

THE BRIGHTEST STAR IN 4-STROKE APPEARANCE AND PERFORMANCE!

This is the O.S. Sirius7 FR7-420 7-Cylinder 4-Stroke Engine.

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

FEATURES: 

Main internal parts such as the crankshaft, cam holder and reduction gear are all plated to resist corrosion V-shaped individual valve covers for vintage scale appearance

Impeller system distributes air-fuel mixture equally to each cylinder ensuring high performance and smooth idle

Padded and lockable aluminum silver colored storage case

Two year limited warranty through Hobby Services beginning at date of purchase

INCLUDES: 

O.S. Sirius7 FR7-420 7-Cylinder Sirius 4-Stroke Engine, seven type F glow plugs, valve adjusting kit, radial mount & hardware kit, needle valve extension cable, drain plug, carburetor insert, decal, glow plug cable set, instruction manual and aluminum case

REQUIRES: 

Fuel: Aircraft blend 5-10% nitro content with 8-10% lubricant content (it is suggested to dilute commercially available 15% nitromethane and 18% lubricant fuel with methanol half and half to make a 7.5% nitro and 9% lubricant fuel)

Propeller: 22x10-12, 23x8-12, 24x8-12, 26x8

SPECS: 

Displacement: 0.6071cu in x 7 (9.95cc x 7)

Bore: 0.944" (24.0mm)

Stroke: 0.866" (22.0mm)

Practical RPM: 1,500 - 7,000

Weight: 111.7 oz (3,167g)

Crankshaft Size: UNF3/8-24

Distance from Backplate to Drive Washer: 6.2" (158.5mm)

Outer Edge of Backplate to Pushrod Covers: 4.8" (122mm)

Outer Diameter: 9" (230mm)

Carburetor Settings:

Needle valve, 2-1/2 turns open from closed position

Throttle Valve, approximately 1/4 turn open from closed position, then start engine and follow break-in instructions on pages 19-25 in manual