2006 Panther 660, just did the bearings about 300 miles ago...son of a gun.
I've never seen a drive shaft break in half. Nothing caused it, no impact or anything like that and surely the 50HP wasn't a factor. He was just driving along and said it was like the brake locked up. Getting it out was interesting as the track doesn't move. We ended up using a roll up sled which was very exciting. Let's just say it's like trying t drive a rudderless boat, 10 miles of it to boot. I'll see if I can get a picture of the setup.
I sure hope it didn't foul up anything in the chain case. Oh and the drive shaft on this guy is NLA. It's an odd ball used only on Panther 660s. Pretty much a mechanical spedo drive but with the newer style bolt and not the stud on the chain case side. I've got a plan though, the old style stud shaft and my lathe should make it right.