Ok some of you guys said that the stator/rotor can go bad on these bikes causing the ignition to advance and blow a hole in the piston. If that is what's wrong with my bike, is there a place to get a new part for it or just go with an e-bay or junkyard one? I'm still at a loss how this exactly effects the timing of the bike . . . . any aftermarket ignition kits for these? bike is a 79 cm400T1