I second what old propnut said. On other four strokes the choke assembly is just that, plus a velocity stack. But on the TT it is a venturi that is slightly smaller than the carb throat. That means it acts to help draw fuel even when the throttle is wide open. You may be able to get it to run well on the ground. But you will have a dead stick after using about a 1/4 of a tank of fuel.