NEED TO REPLACE REAR TIRE YAMHA VSTAR 650 2000

Your best option is to fit the rear wheel rim with a taller tire. If your stock tire is a 170/80-15 then try to locate a taller 170/90-15 tire or a 170/100-15 or a 180/80-50 or a 180/90-15. This will lower your RPM's in high gear. Caution make sure you have clearance for the taller/wider rear tire. If your have 2" all the way around the between the tire and the swing arm, this will be your easiest fix.

Howdy: Front, jack stand, pull calibers with brake hose connected and set aside. Unbolt axle clamps each side. You home free. For the rear,
juck stand, loosen rear axle nut. Pull calibers, set aside. Need to wiggle
tire backward so the driveshaft pulls out. thats about it. Puttin the front and rear back on you will need help for alignment. Goog luck - Doug

The final drive assembly has to be unbolted from the swingarm and it is removed with the rear wheel. Once the assembly is off the bike, the axle can be removed and the final drive separated from the wheel.