A few days i asked for help for a rattle on the right side head pipe against the brake lever on my '08 RK. I got several good responses from the fine folks at HD forums but couldn't solve the rattle permanently. For any of you who are experiencing this or plan on putting dresser duals on your scoot here's the answer. You have 2 options for head gaskets, the original equipment thicker tapered style or the thin flat gaskets. USE THE THIN ONES. 'nuff said.