Re: 150HP Outboards, 2000 and Newer Purchase Suggestions
I asked a marine mechanic which he preferred, 2 stroke or 4 stroke. He said, "I like them both--all of them break down."
I have a carbed 150 Yam (2003) on a 21' Sea Hunt deep V. I like it, and like basic dependability. I don't have stats or comparisons, but it burns some gas and, it seems, a lot of oil, too. A mechanic/dealer, discussing a theoretical replacement if it dies, said it will run until you get tired of paying for it.
I think if I'd had the choice I might prefer an HPDI. I go back and forth on the 4 stroke, with its reputation for not handling ethanol well, slow start, and extra size/weight.
Since you are buying used, you probably won't have a side by side choice, and I don't know that the engine type will be a deal maker or breaker.
As a side note, I think a lot of boats like mine (a mid-level boat) were rigged with the Yam TXRB or similar b/c it was the cheapest, most basic, popular motor. I think I'm a tad underpowered, but that, too, was a way to be competitive. So if it matters to you, think about something a little better and bigger than "stock" if you find, as I did, a basic rig. It's not enough to say no, or be unhappy with the boat, but if you have the choice, go up some.