Sponnie, have you checked your carbides out lately?? My g/f has a 1998 vmax 600 had the same problem. We put on some kimplex skies with 6 inch stud boy sharper bars seem to have fixed the problem. I was also looking into studding the track. If you smash the throttle going 50+ and notice track spin then this could be adding to your darting problem.
Yamaking start a new thread in the Yamaha section next time instead of posting in a different thread. Seems like a decent deal for that low of millage and that price. But, why was the track replaced and the sled torn down with that low of mileage?? You got any pics? Your mileage should be any where from 10-13 depending on how you ride. Maybe even more if your not too hard on the throttle.