I own a 07 Screaming eagle Road King. I was hoping someone could help me out with my thoughts on Spark Plugs on this bike. This bike has the 110 motor in it. I have replaced the plugs many different times and have cleaned them too. I have 33k on this bike and it runs very well most of the time. If this bike starts to run rough or pops going down hills I know it's the plugs. I can clean them a few times then I replace them when they look like they are getting some wear on them. How often do you replece your plugs in your HD?? It this normal changing out the plugs every 5k to 7k miles??