600 twin didn't come out until '98 and it was the Powder Special. 600 EXT in 97 and 98 was the ZRT triple/triple engine.
I had a ZRT 600, stock, bought it with about 400 mi on it and put close to 4k mi on it in 1 season! It was one of the most reliable pull and go sleds I've ever owned. More miles on that sled in 1 year than I've put on any other single sled total. The only problems I had were it would rattle loose the recoil screws and the recoil would slip/fall off even, didn't want to loctite those little screws though and something went t!ts up in the primary clutch but wasn't a big deal as I dont even really remember it. Broken spring maybe.
Mine was a 121 trail burner and it would run with the Doo and Poo 800's across a lake that year (2000). I was at low altitude, so subtract power accordingly depending where you ride.
I don't know how finicky the jetting was/is for altitude changes (my Poo XCR 600 triple was terrible for alt change. Every thousand feet that thing needed re-jetted to run right it seemed).
It worked very well in the powder for what it was (3/4 lug track w/ picks). The front end stayed up, it was not a diver like my XCR. Had awesome snow that year back east and it saw alot of 2'+ powder days.
$2200 is wishful thinking though even with the low miles. It's not a collectors item, yet. You can find alot of good 700-800cc real mtn sleds (Gen II Poo's, Mtn Cat 800's, ZX Summits) for $2k or less that will be, by nature less finicky because they're twins and will stomp on the EXT with longer/bigger tracks.
If you could get closer to $1500 and get some feedback on how finicky it is on jetting I'd say get it. That was the baddest sounding, smoothest running sled I've had. Triples are awesome.
I used to think the same about "new" machines that sat a long time without being run, but if it's really been stored well, shouldn't be aproblem.
I picked up a '80 Cat for my son a couple years ago, 500 orig mi on it, hadn't been run in alot of years, great shape. I figured, carb boots, crank seals, carb gaskets, fuel pump seals, all that stuff would be done for, but ran it last year and now this year with no issues at all. All I did was clean the carb, replace all the fuel and oil lines 'cause they were brittle and threw a new fuel pump on it as preventative maint.
Edit: Re read you orig post. If you're on trail more than off you'll like the ZRT (EXT) for sure. Just let someone comment on jetting. That would be my only aversion to it.
