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400ex intermittent spark

9K views 4 replies 5 participants last post by  dnorthern 
I had an intermittent spark issue. Spark at the plug when I hit the start button and when I let off but nothing in between. The problem was the voltage regulator/rectifier was shorted to the body of the regulator/rectifier. I removed the regulator/rectifier from the frame and I had spark, runs great. Replacing the unit now.
 
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