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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!
 

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CDI ignition works by a capacitor discharging high voltage as you get no spark at your plugs the discharge is not happening or its not getting to the plugs. Have you checked the plug caps/cables. Also how is the battery. Check any safety switches and also the kill switch. Spray some WD40 into the bar switches to clear any debris. As it failed suddenly I would be re checking all electrical connections fuses and relays.

It is not a good idea to try and shotgun problems....esp electrical ones as something that looks good may not be and fitting new parts can confuse the issue and make it worse. Also I dont think diagnosing problems by fitting numerous new parts is a very logical way to go about it which electrical problems need.

First part you should have bought is a digital multimeter and followed the instruction on how to use it and got hold of a set of electrical specs and circuits for your bike.

Still no good shutting the stable door now...get a meter and specs then start again


Good luck
 

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Does that model have a safety switch on the side stand ?
I think they came into wide use about that time.
A failed sidestand switch can cause an elusive problem like that.
 
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