Hey everyone new to the site and have a question. I picked up a 87 570 exciter in good shape for 400 bucks an it was running fine. All the sudden it just died on the trails on me like someone hit the kill switch. I check and now their is no spark. The lights had been acting weird prior to this almost like their is a loose wire? Or is this something more like the coil or magneto? Any thoughts would be appreciated.....Once again it ran fine now their is just no spark.