Have an 06 SK650 which "supposedly had new rear drive sprockets and new tracks on it when I purchased it. And I know they looked new. I have a lot of trouble with it throwing the tracks and I have to be extra careful and keep my ears open for the sound to try and keep it from happening. Dealer said he's not had any problems with that. Not sure what's going on, I keep them tensioned to spec. but I can't even work for a 1/2 hour without it either throwing one or trying to. OTOH, I'm pretty good at getting them back on in jig time! Any ideas?