A complete set of relevant tools for adjusting the valves on all O.S. four strokes. The kit comes in a tough plastic case and includes:

* 0.04mm Feeler Gauge
* 1.5mm Hexagon Key
* 0.10mm Feeler Gauge
* 5.0mm Wrench

Please Note - The screwdriver pictured is no longer supplied as part of this tool kit.

The smallest and lightest in the O.S four stroke range. Features include a camshaft carried in bronze brushes and a pair of spherical thrust bearings.

(Tick the check box to add 2 x OS F Plugs at a discounted price when purchased with this engine)

This engine has an all-new design which is more powerful internally and externally compared to the closely related FS-48. Features include front mounted helical driven camshaft and is supplied complete with silencer.

(Tick the check box to add 2 x OS F Plugs at a discounted price when purchased with this engine)

The first engine in the new FS 'Alpha' series the increased capacity compared to the 52 means more power and the improved carb means even better throttle control. The crankcase breather/oil recirculation system is internal so no external nipples or tubes are required. Supplied with effective 'new style' silencer.

(Tick the check box to add 2 x OS F Plugs at a discounted price when purchased with this engine)

The first OS four-stroke to feature an ABC pistonliner assembly and imparts a unique sound when running. Delivers strong performance at a budget price and features a double lock-nut system for safety purposes.

(Tick the check box to add 2 x OS F Plugs at a discounted price when purchased with this engine)

The new FSa-81 is a direct replacement for the FS-70 Surpass II, offering greater power and throttle precision in a compact and lightweight design. The crankcase mounting dimensions allow the FSa-81 to slot into the same mount that an FS -70S II would for an instant power upgrade.


Like the FSa-56, the crankcase breather system has now been incorporated inside the engine to negate the need for an external vent and the excess oil that emanates from it. A propeller locknut assembly is of course
standard.

The new F-5030 silencer is very effective, thanks to it's internal baffle and carefully matched internal volumes and passages. The design allows a huge range of outlet positions to accommodate almost every model. Even the distance away from the engine can now be adjusted.

The latest 60RA carburettor now features a 'constant velocity' inlet for improved throttle response and reduced spitting.

(Tick the check box to add 2 x OS F Plugs at a discounted price when purchased with this engine)

Honed to perfection in this latest model; the new FS-91 Surpass II features a new carburettor; longer crankshaft; plated camshaft; crankshaft & ring. Offers great performance along with O.S`s legendary quality and long life.

(Tick the check box to add 2 x OS F Plugs at a discounted price when purchased with this engine)

The latest version of the 91 Surpass with a pump system and regulatory carburettor.

(Tick the check box to add 2 x OS F Plugs at a discounted price when purchased with this engine)

This is the economy suction fed version of the FS-120S engine without a fuel pump or pressure regulated carb.

It is one of the largest cylinder four strokes in the O.S range. Features a simple yet highly effective twin-needle carburettor which delivers a constant low idle speed; smooth progressive transition and power consistency.

(Tick the check box to add 2 x OS F Plugs at a discounted price when purchased with this engine)

An updated version of the FS120 MkII now fitted with an integral O.S.Type PG-03 fuel pump and carburettor with built-in fuel regulation to offer the maximum engine reliability irrespective of the fuel tank's position and model attitude.

The FS-120 MkIII features four ball bearings and a special propeller locknut assembly as standard.
Ideal for aerobatic, sport and scale models it is is designed to be used with 14" x 9~11" to 18" x 6" props. Click here to select and purchase appropriate props.

(Tick the check box to add 2 x OS F Plugs at a discounted price when purchased with this engine)

Largest cylinder four stroke engine that O.S has ever made it is a powerful high-torque engine. Features a specially designed twin needle carburettor and silencer and has been extensively plated for corrosion resistance.

(Tick the check box to add 2 x OS F Plugs at a discounted price when purchased with this engine)

A needle valve extension that allows the main needle valve to be adjusted when the engine is mounted in a cowled model. Manufactured from flexible stranded wire so that the needle is protected from vibration damage.