the lvs ring of my minister II is quite stiff too. when i disassembled the lens to clean the shutter, i lubed the ring a bit inside. but i didn't really recognised a big change.
anyway congrats to your purchase. the yashica m II is a very nice looking camera. the lens is not razorsharp, but capable to produce some nice pictures. i especially like to use it with colour film. have a lot of fun!