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O.S. FS155-a Alpha Series 1.55 4-Stroke Pumped Engine


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437,24 €

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200-size power in a 120-size package!

How do you get 200-size power from a 120-size engine? O.S. calls it the FS155-a. Since the FS155-a is a pumped 4-stroke, you’ll enjoy 2.6 hp at all times, regardless of tank position, attitude or fuel level. Its novel recirculation system bathes working parts in constant lubrication, for less friction and wear!
  • Also included: F-6020 muffler, Type F glow plug & PD-08 pump.
  • The same 2.6 horsepower as many 200-size power plants — with the dimensions and weight of a 120-size engine.
  • Because it's a pumped 4-stroke, you’ll enjoy plentiful power regardless of tank position, attitude or fuel level.
  • Instead of oil venting through the crankcase, it’s re-circulated to lubricate working parts — reducing friction and wear as well as cowl cleanup.
  • Includes the 70R regulating carb for superior throttle response and precise fuel metering.
  • 2-year limited warranty.

Technical data

  • Spacer holes lengthwise: 25 mm
  • Transverse spacing of holes: 58 mm
  • Width: 67 mm
  • Speed range: approx. 2000-10000 rpm
  • Recommended propeller: 16x8~12", 17x8~12"
  • Height: approx. 138,6mm
  • Stroke: 28,6mm
  • Displacement: 25,36cm³
  • Length to hub: 127,5 mm
  • Power: (HP) 2.6 at 10,000 rpm
  • Carburettor: 70R
  • Shaft thread: UNF-5/16-24
  • Bore: 33.6 mm
  • Engine (Only) Weight 28.4 oz (805 g)
  • Total Weight 32oz (900g)
  • Power Type Glow



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