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OS Engines FS155-a Alpha Series 1.55 4-Stroke Pumped Engine

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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.

    Product Specs

    Bore
    1.32 in (33.6 mm)
    Crankshaft Threads
    UNF5/16-24
    Cylinders
    Single
    Displacement
    1.548 cu in (25.36 cc)
    Engine (Only) Weight
    28.4 oz (805 g)
    Muffler Weight
    3.35 oz (95 g)
    Plug Type
    Type F glow plug
    Power Type
    Glow
    Product Height
    5.4 in (138.6 mm) from bottom of crankcase to rocker cover
    Product Length
    5.0 in (127.5 mm) from carburetor to drive hub
    Product Width
    2.6 in (67 mm) at mounting tabs
    Prop Range
    16 x 8 - 17 x 12
    RPM Range
    2,000 - 10,000 rpm
    Stroke
    1.13 in (28.6 mm)
    Total Weight
    32oz (900g)
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