Hello I have a 75' 70hp Johnson loop charged motor took it on the lake had a mid range shudder it seemed so I cleaned the carbs and synced them agaon, tried again on the lake motor still shuddered then cleaned up when my boat started to plaine out . Took it to a mechanic he said my number 1 cylinder was looking spark then coming back at full speed . Spark had a solid 3/8 air gap real blue arc from the plugs problem is.we cannot diagnose the cause of this issue if its a bad stator or coil?? Also put in new plugs when the.cylinder lost its spark the plug would be a little wet any suggestions? We tested the cylinder by pulling plugs off 2 and 3 cylinder to find it was that cylinder. Any help or suggestions besides new plugs wires??
