I live in western Colorado and have an 02 660 Grizzly with about 1600 miles on it.

 

I had my machine jacked up in the shop and was giving it a thorough once over with complete oil and gear lube change. While spinning the wheels, I found that the left front spun freely and the right front acted like it had bad bearings or a bad axle joint. It would turn about 1/8 turn and bind, and the same thing over and over. I pulled the hub and found that the bearings were good, and spun the axle and found that the binding was in the differential. I couldn't feel it in the steering when bringing the machine into the shop. I went to the local dealer, and the parts counter guy said this was normal. The oil that came out of the front differential was clean and looked like new.
Do you have any thoughts?

 

Welcome to the forums.
I wonder if it has anything to do with the limited slip front end. It may cause one side to "bind" while the other spins freely. Just a thought. Another thought is to ride it a bit and see if the right front hub is hotter than the other side. If it is binding it will heat up a good bit. I'm not much of a mechanic so these are random thoughts. Try the Yamaha section to see if anyone else has had this kind of issue.