What I'm trying to figure out is, what carb offers the best value for an XRL with the following modifications: -10.5:1 piston -hot cam -full exhaust The goal is to achieve the best mid-range horse-power for wheelies and other childish shinnanigans. Options I've seen -XR650R 40mm non-pumper ~$75 on eBay -Keihin 41mm FCR Pumper ~$525 on XRsOnly -Mikuni 41mm Flatside Non-pumper ~$230 on XRsOnly -Mikuni 42mm Pumper ~$435 on XRsOnly -Mikuni 45mm Pumper ~$435 on XRsOnly -Edelbrock 41mm(?) Pumper ~$400 on eBay So, feel free to chime in with your personal experiences with any of these carbs, paying particular attention to the mods that will go with it. Note: I'm not willing to pay an extra $100 for .05HP. If the cheapest carb gets me 3 mid-range HP for $250, the $500 carb must get me 6 mid-range HP. Thoughts?