I've been sniffing on replacing the stock carb on my 01 XR400. I have read posts dating back 5 to 6 years on the subject which include MANY different makes, models and sizes. Given the time and effort people have put into researching this topic I'd like to come a consensus on what's the best offerings right NOW (Fall 2013) with respect to ....... 1. Improved Starting 2. More performance 3. Future Big bore kits Thanks in advance for everyone's thoughts.