I'm trying to remove the rear wheel on my 2007 Suzuki RMZ450. I've removed the axle bolt and tried banging the axle with a rubber mallet for about two weeks now. IT WON'T BUDGE. Not even a little bit. It seems to be completely seized up. What can I do to loosen it up and eventually remove, hopefully saving the wheel bearings at the same time?
First, I have to compliment your stamina. I doubt I'd be able to keep swinging a mallet for two whole weeks.
Soak the area in a good penetrating oil. I like Wurth's Rost Off, but there are many choices. Hit it with penetrating oil once or twice a day for a while. Give it a few whacks with a mallet, if it doesn't loosen up, hit it with more penetrating oil, and come back tomorrow. Repeat until it's off.
Otherwise, I think you might have to resort to using a torch to heat the bearings or the axle. After the torch treatment, I'd replace the wheel bearings.