OS FSa-56 with 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 standards to a new level. The increased capacity compared
to the FS-52 Surpass means more power/torque and the new
carburettor provides even better throttle control across the entire
RPM range! There are innovative features like incorporating the
crankcase breather/oil recirculation system into the crankcase
to dispense with external nipples and drain tubes as well as a
dramatic & futuristic style. An effective and versatile silencer is
supplied as standard.