Got a 1980 Express nc50 and im looking to upgrade the carb and also get a big bore kit (70cc). I was on 1977mopeds.com and found the Malossi 21mm Dellorto Carburetor Kit for the Hobbit. In the description it says it will "maybe just maybe..." work on the nc50. Im wondering what they mean saying that? Im sure there will be slight modification involved but i would like to know what. Also if anyone has any advice on anything similar or will get the job done just as well. Thanks for the help.