Those are pretty much bulletproof. About the only major thing that I've ever seen happen to one is that the front driveshaft splines where the driveshaft goes into the front differential can get stripped off. But that's usually only if someone treats them real bad. Other than that, just look for the normal wear, such as worn brakes, wheel bearings, ball joints, and tie rod ends. But these are things that normally wear on all ATVs. Since they have full time 4X4, they usually don't drive as good as one that you can take out of 4 wheel drive, but you'll get used to the way it drives after a while. Top speed is about 45 MPH. The 400 Foremans, like all Foremans, are good ATVs.