I upgraded the ignition on my 78 xs400 from points/condenser to electronic ignition using parts from 80 & 81 machines. Nice blue spark now dancing on each plug. Problem is, I don't know which coil plug goes to each coil. I have 3 different manuals (including yamaha) and all have same wiring diagram. None show which cylinder coil connects to which plug (one with orange lead, one with grey lead). I have a 50/50 chance, but before I fire it up, I thought I would ask if anyone could tell me whic