Which pumper carb for my XR650R SM? I tried the mikuni TM42 pumper carb and now swiched to keihin FCR42.5 MX. I'm very happy with its performance,but it fits in place semi-lying cause it's tall and hits the tank...The problem is that when i park my bike with the stand looses gas from the overflow fuel line what about TM45? and ELDERBROCK too. My exhaust is a full ti-acrapovic system wide open and have no airbox- just a venturi velocity stack. Thanks!!