Thank you. These are good points. Will look into it.So the question I will ask "was it really the spark plug or was it just that you disturbed the plug wires?" and the is another issue leaking behind the scenes. It has been awhile since I had a ST1300 but according to the parts diagram the spark plug caps are a separate item from the coils. I would make sure that the caps have a good connection to the wires. I believe the cap screws on to the plug wire. If it were me I would inspect that connection and maybe trim the wire a 1/4" and reassemble. My 2 cents