I just bought a 98mxz 670 s-chassis with a 583 motor dumped in it for $1000. It has almost 8k on motor and 4k on chassis. The sled has been great, it was a buddy's sled for the past 9yrs and I've ridden it a lot. It has stock gearing, I'm wanting to do a gear mod and possibly some mild port work. My goal is to be close to what a sno-cross sled would be, fast outta the turns, able to stand straight up, but no need to catwalk. I'm very familiar with engine mods and building motors. It has a never opened motor, but with 8k, its getting there, but 125psi each. Current mods, stock motor and intake, stock clutches, stock gearing, MPRP can, 4post custom built seat mod, 6in bar risers, camoplast 1.25" track with 96 studs C/A plastic skis, limiting strap one hole adj. The sled stock did about 108mph with the 583, with the can on it I get about 97mph. All I need is 90mph. Looking for pretty much a crowd pleaser, suspension mods? Gearing mods, not 50ft table jumps, but a nice landing machine.