Just picked up a 2005 660r. Don't know anything about these and bought it on a whim. Didn't even drive it first. Pics looked clean and came with sand and dirt tires. Drove 2 hrs to pick it up and it was clean, started right up, gave it a couple revs and shut it off. Loaded it up and drove back home. Now is when I really checked it out and this thing is so clean,it has never seen dirt or mud, not really a scratch anywhere. Even the skid plates are like new. There's no boot rub marks at all and all I could find was a few grains of sand around the engine/frame. It does have a full Yoshimura exhaust and a really nice(seems to be) polished/chromed eyeball engineering swingarm. The skat trak tires still have nipples and the douglas rims still have stickers on them, the dirt tires have never been used. I'm trying to find out about the swingarm, I can't find much info, and how to tell if it's extended or not? What's the stock length? I did put the dirt tires on and took it for a hot lap around the neighborhood and the thing rips!