Speaking of old 2-strokes...
Occasionally Yamaha 50hp long-shaft 2-stroke outboards come on to the market. In this case (if the seller is to be believed) as part of friend's estate.
The Yamaha 6H4 40hp and 50hp are arguably the finest 2-strokes ever built, and if you're lucky enough to have owned one (I had a 40hp on a Zodiac Pro) you'll never look back. They use 3-cylinder blocks, and if well maintained will serve you well.
Ignore the seller's grossly inaccurate weight calculation. These engines weigh approximately 70kg+ depending on model.
You could always reinstate the transom to full height if you're handy, or ditch the 4-stroke.
Yamaha 50HP Outboard.. | eBay