So I got myself the Carburetor speed kit upgrade from 1977Mopeds: http://www.1977mopeds.com/catalog/index.php?main_page=product_info&cPath=36_115&products_id=420
The jets fit perfectly but the air filter doesn't. It is a Uni UP-4125ST 1 1/4" and as much as I tried - it wouldn't fit on the carb. Even if I got it on it would immediately pop off because of it's small diameter. So I am now wondering if it they send me a wrong model or if I need a converter or if it is meant to fit on another carburetor than the stock one... can anybody help me out with this?