I have a 2010 Nomad, and it was running rough so I decided to look/replace plugs. They were not worn, but did look a little fouled. I replace with original NGK plugs. The bike ran like a new bike, it resolved most of the issues with the engine, for about 400miles. Now it seems it is starting to run rough just like it was before I changed the plugs. I know with the ECU, there are no adjustments, but as lean as these bikes run, I cannot believe it would foul out the plug that fast. It is not using any oil. My mileage is 37mpg, starts normal, etc. Any ideas as to why it would foul the plugs? I do a lot of city driving, but still.......