I just rode my zxi today an noticed it didn't feel quite as powerful. I just checked the plugs and the rear plugs looked normal but the front looked brand new like it wasn't really firing. I grounded the spark plug on the engine and saw a very weak spark. I moved that same spark plug to the middle cylinder and saw a much more powerful spark! Is there a way to replace the bad plug wire or do I have to buy a whole new coil? Where can I buy a coil? Thanks for your help!!!!!