marchyman
Cam Killer
When I installed my new alternator belt, I was lying to the left of the bike on my left side, such that I could push the bottom of the rear tire with my right foot. The belt must be fully seated on the upper/alternator pulley at the outset, and you need to firmly "guide" the belt over the lower pulley while pushing on the tire.
I found it a lot easier to put a socket over nut holding the lower pulley and turn the engine that way. A nail set or pin punch lightly held in one of the holes in the bottom pulley will stop the belt from walking off. It took me longer to remove/replace the front cover than it did to replace the belt.