when you find a dead cylinder by pulling the spark plug wire, you can determine if its dead from lack of fire, or some other issue. If you find you have two cylinders that have no fire, you look at the trigger, three on one side, look at the switch box. If you have two side by side that have fire but are dead, you may have a flooding carb( or no fule to the carb). You can fine tune your diagnosis by using a spray bottle with soem gas in it. Once you find the offending cylinders, spray a little gas down the carb throat, if the cylinder picks up, you know its not getting fuel. You get the idea?
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