I like your screen name, one of my closest friends and co-workers had a dog he loved very much, he had named him “Brown Dog”. I remember when Brown Dog passed away, sad time for my friend. I’ve lost touch with him since we both retired, I think of him whenever I see your posts.
You are correct, It is a gasser, Kohler 27hp twin, I wouldn’t say it has excessive vibrations, but it is loud. It’s probably at least 20-25 years old, Great Dane Chariot Lx 72” deck.
It’s been very reliable, I think it has about 800 hrs. hydrostatic and built very solidly. I recently added a suspension seat, which was probably my biggest complaint with the mower, it had a terribly rough ride, new seat helps quite a bit. I think we paid about $8k new, which I thought was outrageous back then, went from a cub cadet rider that was a 42 or 44” deck I think, the zero turn cut my mowing time in half. I also wear a set of radio headphones while cutting.
Mike