This engine looks similar to the OS46AX but as I don't have an OS AX (46 or 55), I can't compare them. This is an ABC type piston liner and twin ballrace design. I had some initial problems setting the idle mixture but that has been sorted (I would have thought that the idle mixture would have been fairly close when the engine is sold but that was not the case). Anyway the engine is still being run in, but it is a good performer. There is also a 46 size.
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