Hello, I use the standard plug in my 650R, an NGK DPR7E. I noticed in my manual that 'for extend high speed riding' to use the DPR8E. My local Honda shop (idiots) told me that the 7E was the hotter plug. I do lots of high speed dirt/street riding, like 200miles at 70mph+. I have no problems with my standard plug, but I was wondering if I should be using the cooler 8E plug as the manual recommends. Anybody have any comments on this?