I have an 03 700 with a 156" track. I like it, a lot. Risers - I got about 5" out of mine with careful relocation of what was there. 4 is safe, 5 can be doable, at least on some sleds - hard to say, I've seen posts claiming 4" was tight, others claiming they did 6" without changes.
I put Simmons Gen2s on mine, too - I like them, but they do affect sidehilling/getting it on edge.
I geared mine to 19/46. Stock was 21/43? I think? Pretty big change, and nearing "too low" on groomed roads, although I'm trying a different driven-clutch spring that allegedly will help fix it. I have the purple spring in there, and supposedly, it is stiff/soft (not sure which) enough to make it rev to the moon when just cruising. We'll see, but I might put my 21 back up top, if the chain will accommodate it. It is great for slow stuff, deep snow, trees, and it's primary use, moving two people uphill (90% sled-skier).
They do have a tether. Both my 99 670x and 03 700 have tether issues occasionally - once in a while, the sled will start, but not go anywhere. Grab the cap and twist it back and forth, voila. No _problem_, but sometimes annoying. It has never taken more than a couple of twists to get it back to life.
I've not had any issues with mine (either one, but specifically the 700). It has ~4000 miles on it, ran well last I rode it. A SkiDoo mechanic friend rode it earlier this year and said it "felt a bit soft." Huh. So, it is currently getting pistons and rings. It was 122/125psi at 6000'. Not AWFUL, but maybe a bit low? Who knows. Good peace of mind, but at the same time, if you search Dootalk forums for "high mileage," you'll find that a LOT of 700s have broken the 10k mile mark. More than a couple. They seem to be pretty durable sleds.
My oil tank leaks at the seam, so I don't normally fill the bottle more than 1/2 way/beyond the seam, unless I know I have a LONG road-ride to get back to where we're skiing. Not bad enough to fix, but if I fill it then let it sit, it leaks oil a little.
Lousy mileage compared to the 670. The 670 FEELS faster than it, but in all the drag races we've had, they're pretty comparable. The 670s motor is just more abrupt. When I fill the tanks before a ride, if the 700 takes 5 gallons, the 670 takes 3-3.5. Weird. Pretty dramatic difference.
I took my windshield off. No problems, makes rolling it out of holes easier.
The 03s running boards load up with snow, as mentioned, and the holes in the 03 are bigger than on the 01. Better Boards or something is a pretty good idea; the 03 is annoying in that respect sometimes, the 99 670 is downright dangerous - and the 01 ZX boards are a LOT closer to the 99 670 than the 03 700s in terms of ability to get rid of snow.
dummmm, whatelse? I've not owned many sleds. Two, exactly. I bought these two a year and a half ago specifically for sled skiing, based on recommendations from my SkiDoo mechanic friend. He told me to get either a Summit 700 or a 98/99 670x, based on what I wanted to use them for, how much I had to spend, how much I value reliability.
I don't regret either one for a second. I paid $2750ish for mine in the fall of 08 ($1600 for the 99 a couple monts later). The sled is WAY more capable than me, and has been bomber reliable. It fouled the plugs once (after I rolled it out of a hole....).
I really like the 03 ZX. The 670x, the last of the "S" chassis, well, I _like_ it, but the ZX is just a better sled in all regards - it rides better, works better, looks better, it is just _better_. I probably did not NEED to put pistons in it, but it is good for peace of mind, and if it DOES pick up a HP or two, even better. At least I know it'll not break a piston anytime soon
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Iain