There are a list of things that can bite a TCI ignition. One oddball issue is that XS650 charging rotors often go bad, the magnet that the pickups see is embedded in the rotor. Non tci rotors (no magnet) look very similar and bolt on. Several members have reported that aftermarket replacement rotors are sometimes a touch thinner than the stock one. This moves the magnet far enough away from the pickups that they won't send a signal to create a spark. And it IS possible you have bad TCI. My point is that spending money on electronic parts hoping you will find the bad one is seldom smart. Some TCI failures can be fixed, others require replacement of the TCI $$$$ or conversion to an aftermarket ignition.