After installing a new carburetor (12.5 to 17.5), the scooter won't start without brake cleaner. What's the problem?

I bought a new carburetor. It's brand new and not dirty, but it won't start without brake cleaner. I have a cable choke, but it doesn't work properly on the 17.5. I can't really move the inside. I can pull the choke, but the choke in the carburetor only moves a little bit. Could that…