Originally Posted by
Steve Litzell
Well, You are way off on your thinking . Fuel mixture, ie: jet size has more to do with where motor is run and the range the motor is run in. The very basics are , if you have a big carb, it does not mean you need a big jet. The thing here is the air pump underneath the carb and it's ability to pump and use more air/ Fuel. I think what you are tring to understand is the fuel curve. A given motor at a certain RPM requires a certain mixture. The higher the RPM the more fuel it will need to remain at a good mix. Carb size has little to do with jet size, but a motor from stock to well modified does. It is all about volumetric efficiency more really than size of carb and to a degree motor size. Steve