I had a Microplus for a very short time. I shan't go into it too much as it wasn't a fabulous experience.
From memory Microplus 501s are rated for 85hp., but most are short shaft only and I really wouldn't stick more than a 50 on them. They're VERY old now and they were rated for the old crank-rated light 2 strokes.
Helpful hint... Don't EVER shut the throttle totally from full speed without turning the boat as well or you're liable to have your own wash swamp the outboard.
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