Just another problem and I know nothing about this. (Karting is fun as hell though!!) when taking off my kart kind of hesitates for less than a second and then kind of jumps into gear. Hard to explain sorry. What can I look for?
most clutches engage at 1800-2200 rpms. A bad spring would cause the clutch to take off on idle, not jump. Jumping is probably a dirty clutch like suburban said.