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CX500 not sparking - Smoking top of Regulator

7094 Views 45 Replies 12 Participants Last post by  marshallf3
just picked up a 79 CX500 with 30k miles on it . I'd like to give a big shout out to all ye CX500 owners ! I've already met alot of you online




has the CDI ignition , things i've checked are . kill switch ok , starter button ok sending voltage to the yellow/red wire to solenoid when i push the start button(new Starter Solenoid coming in mail this ones not working) . when i jump the solenoid she cranks over fine but i get no spark .. shouldnt it be sparking? pulled plug and have it grounded to bike at a good ground. also i have cleaned the ignition coil connections on both coils to make a good ground. so my question is shouldnt it be sparking by jumping the solenoid? These are new NGK plugs .. old one not sparking either. I did also check for voltage at the coil wire connection before coil to see if getting any voltage to it .. nada. oh and i also did check the flywheel through the timing hole on the engine to make sure its turning .. yup its turning.





also i have read about the neutral switch . i do get a neutral light when electric is on . that wouldnt make it not spark would it? also checked the pickup coil continuity o/w wire to lt blue/white wire on the engine side. i also checked for some AC voltage at these wires when cranking by jumping the starter relay and its getting voltage there. Its cranking over fine , i even tried to jump it with my car battery still no spark so not battery related.





something with the CDI or Stator related me thinks ? oh also i did think of something else . i did have the front head light/instrument cluster on but it wasnt all hooked up with the ground. i have left it off unconnected until i paint it .. do i need that on and grounded right for it to spark ? just a thought , seems to me if i'm getting voltage at the starter relay solenoid when i push the start button it should be ok and crank over and spark eh? i have been wrong before tho .. once i think








looking forward to continuing this CX500 resurrection
.. haha any help apprieciated.





what my bad boy looks like now



Pic 1

Pic 2



when i get done with her it will look like this one



Pic 3
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You seem to have checked most items I could think of. The one other thing I thought of is the coils are mounted to the frame under the tank. Under their hardware, the frame is unpainted - to supply a good ground between the frame and the coils. If this was either painted over, or corroded, you could be experiencing sparking issues.
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