Originally Posted by GeorgeCk

51020 pipe, with what header?? Does it happen to use the 41032 header?

​​​​​​For engines like the rolling temps up to 284°F are normal..
When I was using the 41032 header with the 9901,9886,9853 pipes I was seeing temps about 20°F higher than when using the 41021, 41031 headers.

​​​​​​Have you checked you fuel tank, fuel filter and tubing for air leaks? Be sure that they are ok..