O.S. FSa-72 II with F SilencerThe O. S. FSa 72 II is the latest version of this popular sized, high performance four stroke engine. Updates include a revised oil breather system which now vents from the crankcase rather than being re ingested in the inlet to improve the running consistency. The rocker cover is now black in order to improve the appearance of the engine when fitted to a scale model. The FSa 72 II sharing the same mounting dimensions of the previous generation aswell
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