Have 1980 or 81 Mercury 4 Hp. Works good. Looks like it should have reverse but not sure. Has hose connection for portable tank. Does anyone now if it should have reverse.
I had a Merc 4 hp from 1978. Two stroke with tank built in. Reverse was - turn the engine around.
Man that was the best 4 hp I ever saw. Significantly faster than any other I saw. The crank broke. I think that was a problem that killed many of that model and it was discontinued eventually.