coil

bike started runnin crappy...pulled plugs and noticed #1 is wet and has very weak spark...did okloahoma heat test on pipes (lick finger and touch pipe) and #1 is cold...2-4 working ok......is it possible for the coil to go bad on one side???....any other places I should look???....jus curious...

This is not related to the coil because if i exchange the electrical cable from one coil to the other, the problem is moved to the other coil (Cyl 1 and 4). So there is no power comming to one coil.... I need help, where is the spark box located on this machine !!!.