When im riding the lights seem a little dull and the tachometer jumps around on slow down ect, if I engine break its even worse. When i hit a bump in the road the bike sometimes brightens up the lights ect get way brighter then go back to duller. I hear a spark noise on startup. This started today and I had to drive 45 minutes like this now its parked. 1 hour from home. I am assuming this is either a grounding issue... if so where do i start. I rebuild the petcock recently so possible something there? Any ideas would be awesome everyone!!