Need the model and type number but I thinking you probably have those carburetors that has a metal jet in the carburetor that is known to fall out. Once gone the carburetor will be over rich or it can be just loose. Worth checking.
[Linked Image from i1329.photobucket.com]
The carburetor on the left is the one with the metal jet and the one on the right is the one we have here in the USA and some the Australian models also have which is all plastic. There is also a small rubber o-ring under there holding the nozzle.

Last edited by AVB; 12/01/17 09:33 AM.