Four-Stroke

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O.S. FS-62V w/F-4050 Silencer (L-OS30600)

O.S. FS-62V w/F-4050 Silencer (L-OS30600) The second engine in the new 'V' series of O.S. four strokes is targeted at bo...

£229.99

O.S. FSa-72 w/F-5030 Silencer (L-OS34720) Sharing the same mounting dimensions as the old FL-70 and FS-70U, the new FSa-72 is a simple bolt...

£326.99

O.S. FS40 Surpass w/FS40S Silencer (L-OS35220) The original 6.5cc FS-40 was O.S.'s second production single cylinder four stroke and th...

£189.99

O.S. FSa-110 w/F-5040 Silencer (L-OS35410) Designed specifically to offer more power and torque compared to a .91 size four...

£359.99

O.S. FSa-56 w/F-4040 Silencer (L-OS34300) The new FSa-56 from O.S. is the first engine in a completely new series of adv...

£269.99

O.S. FS-200 Surpass w/F-6010 Sil. (L-OS35940) The largest, single-cylinder four-stroke engine that O.S. has ever made draws on...

£459.99

Ripmax .S. FS120 Surpass E w/FS120SE Silencer (L-OS35530) This is the economy, suction-fed version of the FS120S engine - without...

£409.99

Ripmax O.S. FS120 Surpass III w/F-5020 Silencer (L-OS35540) An updated version of the FS120 MkII now fitted with an integral O....

£439.99

O.S. FS91 Surpass II w/F-4020 Sil. L-OS35920 Developed from the popular FS 91 Surpass and honed to perfect...

£306.00

£265.99

O.S. FSa-110-P W/F-5040 Silencer (L-OS35420) The FSa-110-P is a great engine to increase power when you want to replace a ...

£382.99

O.S. FS-95V w/F-5050 Silencer L-OS30900 The first in a completely new series of four stroke engines aimed squarlely at the sport and sca...

£279.99

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