I agree...I think the #8 can act a little cool, especially when the weather is cooling down now too.

Another thing that has been suggested before here on RCU is that the extended reach of the H9 Super plug (looks like a 4 stroke plug ) helps to keep the fillament cavity from acting like a sump, because the plug body protrudes into the chamber.

Just another idea I have had about the Evo needing a warmer plug is that it has more cooling fins and fin area than most other 2 strokes...whaddoyathink?