Thanks Runner, I'll be having a chat to the people at The Roost as well, see what i can do about getting a bit more out of the bike, where might I get my hands on a carb as suggested? And what pype would you suggest? Akrapovic?
Nardus, I have a Beta 525 for offroad play, awsome monster. That might be why I feel the KTM is a bit lazy. The Beta will outperform the KTM from start to top end without a problem. I also have a WR250 that I recently put a FMF pype on and had a jet kit done, the differance is amazing on the small 250. I was hoping for a similar result if the same could be done to the 640.