After many google searches I found a spec site that said they made 104hp... I don't know if that's accurate or not. I'd tell you about mileage but I've never measured mine, supposedly they get pretty decent mileage.
To sum up the 583: I have a friend who sold his 583 STX at 14,000km and only changed the track/hyfax etc. (regular stuff) and regular tune-ups. Definately a bullet-proof motor.
More than enough power for me, will do 0-80mph like right now. Supposedly guys have radar'd them to 100mph stock, personally I'd say 90-95mph is more likely the top speed in perfect conditions.
Extremely heavy machines (~600lbs with gas in them), not the greatest handling machine but not bad at the same time.
Typical 'problems': Some people find the primer to be confusing and therefore often flood them when trying to start them (no choke on these sleds) but once you get used to it you'll have yours fired up in 2 pulls after sitting all summer, and the choke guys will be pulling for 20 minutes.
Rear upper Idler wheels are plastic and prone to freezing - Ski Doo did a recall and replaced them with ones with a rubber ring around them but most won't have this done... Cheap and easy to replace, only needs to be done once/if the idler wheels have flattened out. Mine has 6500km on it and the idler wheels have JUST developed a small flat spot.
Shocks are not rebuild able, if they go you're looking at buying a new shock.
Possibly one of the hardest sleds to pull over, not that difficult if you are in decent shape. Electric Starts are ~$400.
I'd highly recommend a Formula Z/STX to anyone!!
EDIT: '95 Will likely have the C7 (or C4... I can't remember what the actual name is) suspension (not the SC-10 which came out in 96 on SOME models). No worries, mine also has the C7 and I don't have any complaints with it, it's a pretty smooth ride.
Ad Boiven makes something that makes the C7 suspension better than a stock SC10 suspension (or so I'm told)... I don't know if they still sell it on their site or if you have to find it used.
It is also fairly cheap to upgrade to a SC10/SC10-II/SC10-III suspension if you really wanted to.
1996 Formula STX 583
2000 Polaris Indy XC 600 Deluxe 45th Anniversary
I feel no shame I'm proud of where I came from, I was born and raised in the boondocks
one thing I know no matter where I go I keep my heart and soul in the boondocks