The little 50 ktms can make you pull your hair out. The best place I found on the net for help was ktmtalk.com they have a whole board on them. If it has the belville washer clutch it may be loading to quick or to hard. But then again carb,stator coil etc. can cause problems that even the the best mechanic
will struggle with. Once you get familar with them they are great fast bikes, just takes a little trial and error.