Do you mean inboard or outboard prop boats? are really expensive to maintain because of all the moving parts. Outboard motors are only designed for a few thousand hours of usage. That’s not very long depending on how much your boat.
I had a Yamaha twin, and it was great for a couple of years, but their performance drops quickly after about two years. The impellers wear badly, as does the lining in the pumps, and the nozzle linkages aren’t all that robust. I finally gave up on it, and just got a tri-toon with an outboard.
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