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In order to tell if the top cylinder is sparking or not you would need to hook up a timing light to the top plug wire and see if the light is flashing or not. Is that something you can do?
Hook up the timing light to the top plug wire, hit the button, and let me know if it flashes or not.
Okay no problem, there are no time limits here. Just reply back when you have a result and we can go from there.
I won't forget you, usually it's customers that forget about us.