Well, I got an hour's worth of dyno time today and was pleased with the results. Here's the mods to my bike: 2002 XR650R, White Bros header, "E" Series pipe with 12 discs & quiet core insert, side panel cut and screened, UNI filter with no backfire screen, XR's Only cdi, Edelbrock carb (recent sale fell through) #21 needle installed in Edelbrock. My bike ran 51.0 rear wheel hp. The only other XR650R ran at the shop had a HRC kit (cam/piston) and ran a best of 57 rear wheel hp. I understand there is a difference in dynos and operaters. BTW, this was done at G-Force Performance in Santa Clara. They specialize in import street bikes and have never used an Edelbrock carb before.