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Nocturn,
I have a 60hp 4 stroke Yamaha. My manual in the "transporting and storing outboard motor section" states (To prevent problems which can be caused by oil entering the cylinder from the sump, keep the engine in the attitude shown (shown in the down position) when transporting and storing it. It also states in another section if you can't transport it in the down position to use a motor support to stabilize it. I can't imagine Yamaha wanting one engine stored in a different position than another, both being 4 strokes. Like Randy stated , it will also keep water from accumulating in the lower unit which could cause problems in the winter "North of the Mason Dixon line".Good Luck.
John D.
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