Hi Sam, sounds like your having fun with it. I found a 91 Kawasaki Bayou 300 4x4 for $200. early this year. It had bad elec. & mech. probs. at least the tires were almost new. I was lucky one off the moderators had a manual for it that I was able to down load and some times the dealers will have manuals you can down load or at least view. I still have to finish but it does run great. On that drum I some times squirt the spline or key way with liquid wrench, and let it soak overnight or at least a couple hrs. if it's bad and use a puller if possible.
Merry Christmas, Garry