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Bottom cylinder not running. With a single carb how would it only effect the bottom cyliner? Mine looks like weak spark or intermitant spark. Iv'e swapped the plugs and coils but its still the bottom cylinder. The engine runs but bogs when giving it thottle. I rebuilt the carb because I thought it might be from sitting too long and it still does it. When it's running I can pull the bottom plug wire off and it runs the same, pull the top wire and it dies right away. Does the CDI control the spark if it's not the coil or spark plug. If I hold it wide open in the water youcan hear the bottom cylinder trying to kick in but seems like weak spark. 
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