on 1100s they have the hidden vacuum advance like behind the motor ..it could be sticking some ...you can unplug the hose that goes to from the carbs an draw on it ...to see if you can feel and hear it move ...as for coil replacement only id go to hondaman .com to look at his stuff ...he like caters to these old honda ignitions ...and is about the best there is in products for them ...1100 coils tend to crack and be rather no good....pass that C5 is the only true upgrade for ignitions on 1100s ...but never forget it could be all carbs also doing this ...
there is also the sparkers to look at there under the shelter and get hot and melt and cause problems too ...some of these ignition seem to never fail ...personally i cant stand them ...good luck
there is also the sparkers to look at there under the shelter and get hot and melt and cause problems too ...some of these ignition seem to never fail ...personally i cant stand them ...good luck