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



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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)

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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)

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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)

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The second engine in the new 'V' series of O.S. four strokes is targeted at both sports and scale modellers alike.


Like he FS-95V, the FS-62V has a 'classic' design with a scale feel. The performance, on the other hand, is very 21st Century building on the O.S. tradition of technological advancement with each new range.

The carburettor is the twin-needle type for both power and throttle response, the 'Jet Stream' generation silencer allows both flexibility as well as sound reduction.

By sharing the same mounting bolt pattern as the FS-52 Surpass and FSa-56, mounting the FS-62V as a direct replacement is easy and convenient.

O.S. continue to innovate setting the standard others can only hope to follow!

Specification

Weight: 442g (15.59oz)s w/o Silencer

Weight: 486g (17.14ozs) w/Silencer

Propeller Range: 12 x 6, 12 x 7, 13 x 6, 13 x 7, 14 x 6

Displacement: 10.11cc (0.617cu.in)

Bore: 25.0mm (0.984in)

Stroke: 20.6mm (0.81in)

Power Output: 1.1PS @ 10000rpm

Practical RPM: 2400 - 11000rpm

O.S. FSa-72 w/F-5030 Silencer.


Sharing the same mounting dimensions as the old FL-70 and FS-70U, the new FSa-72 is a simple bolt-in replacement offering compact external dimensions and power/torque to most types of model designed for .46 2 strokes or .70 4 strokes.

Like all the FSa series, the FSa-72 has internal crankcase oil re-circulation, a super-smooth carburettor with anti 'spit' inlet and an ultra-quiet silencer.

If you have a flying filed 'noise' problem, then this is the engine you need for your average sport model. The new 61N carburettor provides both linear and fuel efficient mixing to gain you reliability and precision control at all RPMs.

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

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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)

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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)

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The first in a completely new series of four stroke engines. With its deliberately 'retro' styling reminiscent of the very first OS four strokes.


The original FS-120 had twin rocker covers and so do many full size engines in older aircraft. But 'retro' styling does not mean 'retro' technology! The FS-95V is a sophisticated engine, delivering strong power and torque and offers a cost effective alternative to the FSa-81.

The 60P carburettor is a twin needle design for great throttle response and reliable idling. There is nothing worse than having your engine 'cough' at the wrong time when you really need a reliable response. The FS-95V will give you that peace of mind responding just when you want it to. That is why so many discerning modellers choose OS time after time!

There are many models designed for .61 2-strokes / .91 4-strokes and the FS-95V was created with that in mind. She will fit in anywhere that an FS-91S does, so model compatibility is not an issue. The added benefit, is far better silencing from the new F-5050, baffled, twin chamber silencer with an O-ring seal between the cast sections and variable length header pipe. Flexibility of silencer outlet position is well suited to scale installations and there are a variety of optional header pipes too, that will cater for just about every model.

The new 'V' series of OS four stroke engines is here and setting the industry standards yet again.

Specification

Weight: 592g (20.9oz)
Propeller Range: 13x7, 13x9, 14x6, 14x8, 15x6, 15x8
Displacement: 15.59cc (0.95cu.in)
Bore: 29mm (1.142")
Stroke: 23.8mm (0.929")
Power Output: 1.7 @ 10,000 rpm
Practical RPM: 2,100 - 11,000

Our special introductory price is £260-00 inc VAT

O.S. FSa-110 w/F-5040 Silencer.


Designed specifically to offer more power and torque compared to a .91 size four stroke, yet still fit in the same mounting dimensions, the FSa-110 is a real compact powerhouse.

Like all FSa series engines, the FSa-110 has near perfect carburation across the RPM range, and thanks to the carefully designed exhaust, a soft note to minimise your presence to the neighbours.

Precision carburation, internal oil recirculation and dramatic styling are all features of the FSa range and put this and the other derivatives that cut above the opposition.

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)

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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)

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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.

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