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OS FR-7-420 Sirius 4-Stroke Engine



OS FR-7-420 Sirius 4-Stroke Engine

Technical Details:

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.


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.


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


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)

Add to Cart:

  • Model: OSMG1307
  • Shipping Weight: 6lbs
  • 1 Units in Stock
  • Manufactured by: OS Engines

This product was added to our catalog on Saturday 07 August, 2010.

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