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The O.S. FSa-56II is a 4-stroke glow engine for 40/56-class model aircraft, with improvements over the original FS-56a: blow-by oil now exits through a breather nipple on the back plate for more stable operation, and black rocker covers give it a smarter look. It mounts with no modification in the same space as the FS-56a. Includes the F-4040 muffler.