Re: buying a new sled
firstof all in 1997, they made only an mxz583 and the 670 was a late realese that year. I would recommend skidoo, either the 583 or 670 are great sleds and will destroy a yama600. some people beleive the 670 makes more power than the new 700! the only problem with these motors is that you don't ever want to park them on a downward slope or they will flood because of the rotary valves. If you're close to alberta come up here there's sleds for sale everywhere, we still have NO, yes NO snow.