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1981 CX500
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I'd start with the button. Test for 12vDC at the input side of that switch, then test for 12vDC on the output side as the switch is cycled. A likely culprit is the starter solenoid, but it's best to start upstream and work your way down.
Mine was the solenoid. I tried 2 cheapies from EBay, both defective. I finally resorted to adapting and making room for one of the old Ford style ones, much more robust. It was a real challenge to get it to fit under the side cover, had to jostle a couple of things around and grind off most of one terminal but in the end I feel much more secure in my old ride (81 CX500)
 
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