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O.S. FS30 Surpass w/F-1020 Silencer
The smallest in the O.S. four stroke range and, at only 9.56 oz, it's also the world's lightest production model four stroke.
It has most of the features of the larger single cylinder O.S. ...
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Retail Price: £114.99 You Save: £11.50
Our Price: £103.49
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O.S. FS40 Surpass w/FS40S Silencer
The original 6.5cc FS-40 was O.S.'s second production single cylinder four stroke and the first to have the front mounted helical driven camshaft now common to all their single cylinder O.S. four stro...
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Retail Price: £129.99 You Save: £13.00
Our Price: £116.99
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O.S. FL-70 w/F-4030 Silencer
Recognising that four-stroke engines should be affordable to all modellers, the new FL-70 delivers strong performance at a budget price. That does not mean that quality has been sacrificed, that's not...
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Retail Price: £129.99 You Save: £13.00
Our Price: £116.99
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O.S. FS52 Surpass w/F-3020 Sil.
One of O.S.'s most popular four strokes thanks to a combination of quality, performance and moderate price – plus the fact that it is designed for more economically sized, quick to build sport and sca...
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Retail Price: £149.99 You Save: £15.00
Our Price: £134.99
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O.S. FS70 Surpass II w/F-4020 Sil.
Based on the earlier FS 70 Surpass but now incorporating all the features associated with the latest 'black rocker cover' derivatives.
With an awesome power output and a healthy spread of t...
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Retail Price: £174.99 You Save: £17.50
Our Price: £157.49
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O.S. FSa-56 w/F-4040 Silencer
The new FSa-56 from O.S. is the first engine in a completely new series of advanced four strokes. The FS `Alpha' series draws on the experience gained from the Surpass range to develop and refine stan...
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Retail Price: £184.99 You Save: £18.50
Our Price: £166.49
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O.S. FS91 Surpass II w/F-4020 Sil.
Developed from the popular FS 91 Surpass and honed to perfection in this latest model.
Like its 52, 70 and 120 stablemates, the new FS 91 Surpass II features a new carburettor, longer cran...
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Retail Price: £199.99 You Save: £20.00
Our Price: £179.99
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Thor 45 CDI Petrol Engine
The future is here! The THOR 45 CDI engine is a single cylinder, two-stroke petrol engine incorporating an easy-to-adjust Walbro carburettor with integrated pump, fully-electronic ignition system and ...
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Retail Price: £219.99 You Save: £20.00
Our Price: £199.99
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O.S. FS70 Ultimate w/F-4020 Sil.
Sometimes 'compromise' is not required and only the best will do. The FS70 Ultimate compromises nothing and is an all-out performance engine designed for use in the most demanding environments.
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Retail Price: £224.99 You Save: £25.00
Our Price: £199.99
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O.S. FSa-81 w/F-5030 Silencer
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 t...
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Retail Price: £224.99 You Save: £25.00
Our Price: £199.99
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