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.
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
1992 Subaru SVX daily
3 Months Exploring the US on a 950