Summit670, I just remembered that several years ago, another COG guy was having an intermittent miss problem. Since he had two bikes, he just started changing things one at a time. As a last try, he transfered the pick up coils and the problem went away. If it is pickup coils, do the ride test like I said. If it is a pick up coil, TWO of the plugs will be fouled out and black. It will be either the pair on cylinders 1 & 4 or the other pair on cylinders 2 & 3. It would show up on an oscilloscope, but without a dyno to put it on, I don't know how you would read it with the bike under a load. I guess you would have to have a technician that could run really fast