My '87 FXRS isn't starting. At first I thought it was the battery because it seemed to only start when the battery was at a full charge, so I assumed that the battery was bad. I replaced it and still had the same problem. The plugs would only spark one time then stop. So I made sure all the wiring was fine and wasn't grounding out anywhere. I finally traced a problem to the coil and thought I had it all figured out when I found a wire had slipped out of its crimp connector. I repaired that and she fired right up... and then died again. I haven't been able to start it since. I think maybe it's just a bad coil and every once in a while it fires up?