Quote Originally Posted by dipple666
Also 90% of the parts can be used from the thou' because it is essentially the same bike.
Its been a while since I needed to check a part but I wouldn't exactly say 90%. The 650 and Thou have different frames, engines, looms, CDI, exhaust, and a few other bits which are not interchangeable. However, yes some parts can be swapped over. The tank springs to mind first.

As for issues with a K6 650, I'd say none really. Yep its a budget bike and can show in places. Go for something with a good service history and keep on top of the oil level. And on the subject of oil stick 15w in the front forks to transform the handling on the cheap.