I have a 1980 gs550, I am not bike expert, but feel like I can diagnose problems regularly. However, I was riding down the road and my bike suddenly died. I couldn't get it started and realized I was getting no spark whatsoever, so I started running through a list of items I thought it could be. after 2 months of on and off work still nothing. I have checked the pulser coils (electronic ignition) got a new one, checked the CDI box and ran down to the shop to test one they had.....wasn't that. Checked all of the earths. replaced the spark plugs. replaced my whole wiring harness. replaced all of the fuses. checked ohms and voltage and still I cant figure it out. NO SPARK TO ANY OF THE PLUGS. I am getting power to the plugs and the plugs are now new and still nothing. I checked the kill switch and its not that. It turns over with ease, just no spark. Is there a sensor or something that could have gone. This is seriously the biggest mystery and I am lost! Any help would be greatly appreciated!