Wasup guys my friend has a kfx400 with an edelbrock carb he has the twist throttle on it then he went to the thumb throttle and he bought a stock thumb throttle for a kfx400 but it seems it doesn't open the carb all the way like the twist throttle opens it. Is there a certain thumb throttle this carb takes to run right? Any ideas guys would be great thanks oh ya I meant to write edelbrock Im on my iPhone and my fat fingers got in the way.