Yeah,Brandon, it's like when I had to open my emulsion tube holes slightly for better mid-speed performance on my 60cc kit. The carb has a lot to do with it as far as design and throat size, and I'd agree with Ron. Puch also has that funny needle adjustment, right? My carb size is a little small,but the #64 main jet seems to be ideal with the Polini exhaust. My air filter is the larger type Dellorto with extra holes drilled in it for the bigger, reed valve type kit. Ike has all kinds of main jets if you need to order one.