I had been hearing a knocking noise coming from the starter side of the engine for a while. It didn't seem to be getting any worse, so I just figured I'd look into it another day. Well, that day came sooner than planned. All of a sudden today there were grinding, clanging and other assorted bad noises coming from the motor. I shut it down quickly and pushed the tractor over to the garage. It didn't take too long to find the problem; the mounting tangs on the starter pulley had broken off. Not a problem, cause I had a couple more of the pullies laying in my parts heap. The funny part was, all of them had the same new primer paint color. I wonder if this is a high failure item? I wonder why it broke? Did I tighten the belt too much? Is it just a weak part? I needed new mounting bolts too, as the old ones were almost sheared through. BTW: I have found that the starter belt slips unless you use the toothed belt. I think it turns the small radius of the starter pulley better, giving more grip.