We stopped selling them in '93. I started working there in '92. In '94 we started selling Yamaha. Should have kept Mariners. We do not make anything off of repairing/servicing Yamaha. Might see one a week now. Thank goodness we service other stuff. I've got an older 90 HP mariner. Decent motor. Not nearly as smooth as a Yamaha of that same age. But it gets the job done and has only let me down once. Boss still has a '91 model 25 Mariner. Single carb-idles rougher than the twin carb Yammies do. Also a little harder to start but once it's running, it just runs. Come to think of it, I don't think he's used it in about 5 years or so.
Some of the Mariners were Yamaha powerheads. I don't recall which ones...some of the 40's for sure. The Mariner/Mercury company (Brunswick Marine) is about like OMC with the johnson/evinrudes. Merc and Mariner are more or less the same motors but with some minor differences like paint, color, stickers, etc.