If you have to ask "what" it is, perhaps you shouldn't try to change anything. I'm a MMI '94 graduate. Most times I had to repair something it was because the owner didn't know what they were doing and complained about the bikes being junk and denied doing anywork on their own. Just saying.... it's your bike, if you want to work on it that's fine. But bear in mind, you have no cage to protect you from anything in a accident. And if you do attempt any work and it doesn't seem right, please tell us what you were attempting to do. It might be cheaper than me spending a hour on your dime trying to figure out what's wrong. Like the guy that wanted to clean his caliper and put the pads in metal against the rotor. Cost him a rotor, pads and labor. Or the one that wanted to clean his wheel and spokes really good so he took it all apart. Managed to respoke it, but not in the right pattern, and so far out of round I don't know how he rode it in to ask what was wrong. Cost him a new rim plus labor. Actually switching which way your axle is installed can be a issue. Some guys change pipes and don't want to have to remove them everytime they want to take the wheel off. But it changes the clamping force on the swingarm and could cause major issues(death). You also have to be careful about installing braided brake lines. Not all are DOT approved. They could burst and you won't have brakes. Guys would want the cheap stuff. I'd advise against it. I wasn't out to rip them off. But I wasn't about to endanger them. If they wanted unapproved braided brake lines they got them. But the work order stated it was no longer safe to be ridden and it was for show or off road use only. Made them trailer or truck them off the premises and initial or sign the advisory. I wasn't about to be sued by the survivors!