OS FR7-420 (SIRIUS 7) RADIAL ENGINE

Product information

The OS FR7-420 (Sirius 7) is a seven-cylinder radial overhead-valve four stroke-cycle engine of 70cc displacement

The engine maintains the same features of stress free starting, super smooth idling and high torque power which is always the hallmark of OS large size multi-cylinder engines.

With its finely detailed design and outstanding scale appearance and sound, the engine's quality is second to none.

Technical data:

• Displacement: 69,65cc (7x9,95cc)
• Bore: 24,0 mm
• Stroke: 22,0 mm
• Practical RPM: 1500-7000 t/mm
• Weight: 3167 g
• Propeller 2-bladed (recommended): 22x10-12 / 23x8-12 / 24x8-12 / 26x8“
• Crankshaft wind: UNF 3/8“x24
• Cylinder (Number/Syst): 7/4 stroke

Standard Accessories:

• Needle-Valve Extension Cable Set

• Drain Plug

• Carburetor Insert

• Radial Mount Retaining Screw Set
  -Engine mounting screws (M5x25) (5pcs.)
  -Lock Washers (diameter 5) (5 pcs.)
  -Blind Nuts (M5) (5pcs.)

• Valve adjusting tool kit
  -Feeler gauge 0.04mm
  -Feeler gauge 0.1mm
  -Hex. key 1.5mm
  -Wrench 5mm

• Decal

• Instruction Manual

• Aluminium Case

Also available, OS exhaust collector ring for SIRIUS 7 # 04737010-C