Some experience with my NR P5. Thought it was tuned, running good on the track. Temps would run to 230. Then a stranger came over and asked if he could help me out. I watched him make two passes in the streight, lean it out, he repeated that for about 20 minutes. Gave me back the buggy, temps were around 260-270. And I had no earthly idea what fast was until he helped me out. Now I really know what a tuned motor sounds like I became a better tuner. The RB is a good mill, and I am sure your experience will be like mine, shock that this mill could put out the power it does. Good luck with the tuning.