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.

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parts inset
inset 1
V-shaped valve layout matches various scale model airplanes.
inset 4
Optional Collector Ring collects exhaust from each cylinder and vents it through two tubes.
inset 2
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.
inset 3
The impeller distributes balanced air-fuel mixture to each cylinder, which has realized long lasting stable idling.
  • Specifications
  • Exploded Views
  • Parts Listing
  • Accessories
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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)
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: 22x10-12, 23x8-12, 24x8-12, 26x8

Primary Accessories

Stock Number Mfr Number Product Description Quantity Needed
 OSMG3132   72200190  O.S. Plug Terminal Sirius 7 1

Field Equipment

Stock Number Mfr Number Product Description Quantity Needed
        

Optional Accessories

Stock Number Mfr Number Product Description Quantity Needed
 PAAP1453   PT31  Pacer Zap After-Run Engine Oil 1 oz 1
 TOPQ5260   TOPQ5260  Top Flite 22x10 Power Point Propeller 1
 TOPQ5265   TOPQ5265  Top Flite 24x8 Power Point Propeller 1
 XOAQ2308   PJA23X8  Xoar Props 23x8 PJA Series Beechwood Propeller 1
 XOAQ2412   PJA24X12  Xoar Props 24x12 PJA Series Beechwood Propeller 1
 ZINQ2012   2012  Zinger 26x8 Wood Propeller 1