i had a fuel problem on a early 70's merc 115 6 cyl. and it turned out to be a plastic bag that was left in the intake. When i removed the carbs i disconnected the battery before i removed any wires. I removed the plate that is in front of the carbs so access to the carbs would be easier i wrote down what wire went where to make sure they ended up in the right spot and confirmed the locations are correct by comparing them to my buddies merc 115 as it is the same as mine. When i tried to start it up after re-installing the carbs it would not start i checked and found i have lost my spark. I checked to make sure the connections are correct and that all my connections are clean and solid so i am wondering what i overlooked or have done wrong. If anyone has a suggestion please send it on over Thank You