My son's KX now has about 12 or 13 hours on it and the clutch has started to drag once the bike is up to temperature. There is no drag when it is first started, and I have always change the oil after every ride. Does this sound like just the friction and steel plates causing this problem? I have a brand new DP clutch kit in the garage already but I am not sure if these are very good kits? I want to get as close to no drag as possible, so any suggestions on brands of replacement clutches will be appreciated.