Bike: 2005 Honda Shadow Spirit VT750DCb The problem I am having is that one side of my head on both cylinders is burning colder and fowling out. On the front cylinder its the left side, while on the rear its the right side. Each cylinder has its own coil to run off of. I pulled and changed the plugs yesterday finding that the ones burning colder were charcoal black and the ones burning right looked as they were supposed to ( tan in the center black around the outside ). This is the 8th or 9th set of plugs in 10,000 miles and I'm confused. Modifications to the Engine are as follows: - Shorty Exaust no baffles - Hypercharger intake w/K&N Filter - Stage 3 Jet kit 134 / 138 are my jet sizes Lance