Its for redundancy. Buells have terrible grounding from the factory. Its creating a short additional path for eletricity to travel. Through gasketing, seals, lock tight, insulation, continuity through the engine to frane to battery could potentially cause resistance or complete lack of ground, in this case the idea i believe if to create a short path for the secondary ignition system. If your plugs/heads dont have a proper ground, you cant generate a spark. This is by no means a solution to any problem but it has solved issues related to mis-fires, ignition system issues. Worked greate for my Buell a light load cruising misfire cured by this action.