I have an 83 xs ,stock coils ,pamco ign. simplified wiring ,ngk bp7es plugs, ngk 5 resistor caps.The left cylinder would not fire but the right did . I thought it was fuel related so I cleaned the carbs and cleaned the carbs , down loaded the carb guide pdf,read , cleaned and cleaned again. checked valves, cam chain adj. I checked the ground ,swapped out the coil with my buddys coil .Then my buddy flipped my advance rod 180 and the left side ran but the right side stopped running. I am chasing my tail here