Welcome to Stovebolt!
I would suggest first to detail what is happening; maybe some here could offer some testing tidbits to refute your thought that the carburetor is the culprit.
MANY ignition issues are diagnosed as carburetor issues.
As an example, if the plates in the distributor are "frozen" from non-use, and the distributor will not advance; the engine will not increase RPM, and may stall.
I would concur with all here who have suggested trying to troubleshoot your original carburetor first.
Just one thing to consider: Even if the Chinese knockoff is the finest carburetor ever made (it isn't!), what happens if you get a bad tank of gas and need to rebuild the carburetor? Pretty sure the folks that sold you the carburetor would be happy to sell you another carburetor, but not a kit!
I have had some sent to me for rebuilding, and even if I still rebuilt carbs; the machine work that would be necessary would be worth more than buying another DOZEN of the imitation carburetors.
As to parts for your original: the U.S. has sent 1000's of vehicles to NATO countries. Maybe look for a European vendor of military surplus parts.
Again, welcome!
Jon
