Rides well at WOT above 8000rpm and hesitates at 7k as per the graph. On the needle I think it's way rich. Runs poorly. Hesitates all the time. I guess the question I have is what exactly do the HRC parts do? I've bought a set of needles so I'll try the leaner set. Do the HRC X and Y valves allow more air or less than the stock parts?