Ditto on the spark color. Trying to get the motor running when I first got the boat. Checked the spark and saw a yellow spark. Though it may be enough but my experiences with beetle motors told me it should be blue. Eventually determined points were badly adjusted too open, so was not enough time to build up power before spark...resulting in low voltage yellow spark. This was the final key to getting the motor started and running.
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Bill L.
1972 Ericson 27
Hull #61
Atomic 4
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