I changed the front and rear tires on my 650 once ( a few years back).
Its a lot of physical work if you dont have the machine.
I used a large C clamp to break the bead loose. Since the tire is expended you dont care if you mess it up. Its fairly easy with the C clamp, you can crush both sides, and whichever one lets go first, once you have that side started the rest of it pushes right off. To get the other side loose, put a piece of 1/4" plywood on the tire on the side that has been already pushed in, with the edge of the plywood on the rim of the wheel, and the rest of the plywood on the sidewall of the tire, and screw the clamp in on the other side right by the edge of the rim.
The hardest part is getting the tire off and on the wheel, As Dio said you must push the tire on the bottom all the way into the center U of the rim, then pry off the other side. Without the tire mounting machine holding the wheel in place, the tire fights you for every inch.
The other thing that is surprisingly difficult, if you have tubes, is getting your hand between the tire and the rim to push the tube valve stem in the hole in the rim. The new tires are so stiff it really fights you, you cant just grab the sidewall with your fingers like a bicycle tire and bend it out of the way. There probably is a tool for that too, I dont know what it is.
I have decided its worth the $30 to have the shop do it, but its good to know I could do it myself if I had to.
Last edited by KCW; 05-16-2018 at 12:07 PM.