Lurching would be from jetting or from your drive chain being too loose. The latter is very common. Due to KTM's chain slider setup, excess chain slop isn't always immediately noticeable.
1986 Yamaha XT350 For Sale
2005.5 KTM 950 Adventure and 2012 KTM 200 XC-W
1991 BMW 318is turbo track car
1989 Chevrolet Caprice Classic Wagon sleeper tow car
3 Months Exploring the US on a 950