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If you have spark sometimes and no spark at other times, I would check that all the wiring harness plugs are seated/connected properly, and that all grounds are clean and tight, before troubleshooting anywhere else.
I'de also look for bare spots on wires, especially where or near where wires contact the frame.
 

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Willie coil work intermittently or will it just stop working altogether
My experience has always been they either work or they don't.
I won't say it's impossible, but a coil is just that...a coil of wire inside it's housing, and something has to burn through and break the connection, which prevents it from working.
That is why I said to check for loose or bad connections or grounds.

@QuadManiac is the Electrical Engineer, so I'de like to hear his thoughts on this.
 

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So I measured the resistance on the stator plug pins 1&2 measure 0.07 pins 1&3 measure 0.06 the manual says 0.70 to 0.88. I also measured the pickup coil I got 37.72 the manual says 459-561 had spark and ran good then intermittent spark to today no spark. Thanks for ur help
 
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