Take down the competition with the 21XM Version II Outboard Marine engine from O.S.! Designed expressly for small and medium sized outboard boats, it retains many of the features found on the successful 21XM, including the 20J carburettor and #8 glow plug. New additions include efficient air cooling, a larger muffler, aluminium tilt transom mounting plate, outboard unit with flexible propeller and blue anodised aluminium heatsink head.