The OS FS Alpha 56 is a new innovation 4 cycle engine. It feaures sharp and modern look and board power band to suit a variety of model types. Newly designed F-4040 silencer minimizes noise with its soft, low-amplitude sound. Threaded header pipe allows adjustments in the distance between silencer and exhaust and exhaust angle. New lubricating system eliminates the need for breather tubing from the crankcase. It has the same mounting dimensions, drive hub position and linkage position with the FS-52S.