1987 250x. Looses spark after it heats up. Spark comes back after it cools off.I removed kill switch, there is no key switch, reverse safety is still hooked up, new plug,any suggestions on where to start. I have no spare parts to swap with. The only thing close I have is a 1991 Kawasaki klr 250 and a maxxam 150 buggy. Would the ignition coils be swappable, cdi swappable? Thanks