Well if you ever wondered the difference in the drop of the carb size from the 1968 Suzuki T500 Cobra's 34mm Mikunis to the 1973+ Suzuki T500 Titan's 32mm Mikunis. Well unfortunately I do not have the carbs to compare side by side, but really you can get the idea of the difference from seeing these airboots side by side and in my opinion is was quiet dramatic. Interestingly enough it is stated that the performance did not suffer from this change and was a big improvement for the T500's fuel economy. I believe the fuel economy was significantly better, but looking at the difference sizes in the air boots its hard for me to believe the performance didn't suffer by much. Until I take a later model for a ride myself I'm sticking to my wits. I hope I can get some input on this subject from someone with first hand expierence. I love two strokes!!!