hey i'm pretty new her too, but im having almost the exact same issue. bike was running fine , if a bit lean -high idle. now the right cylinder only fires. if i remember correctly the left side cut out off and on a few months ago. anyways now its right side only and i have switched the plugs, switched the coils and put in new points and its running the same. i pulled and cleaned the left carb but it was already surprisingly good for sitting quite awhile. any new ideas?