They change the nozzle set to include a metal jet. This jet can become dislodged and can easily lost if your not paying attention on dis-assembly. You lose it it a new carburetor as it is not available separately. This info was obtain thru the OutdoorKing Forum and the images were provided by the user Bigted on that site.
Images of the part removed, the jet itself, and the part install. Note taper end goes in first. These are shown along with old style carburetor.
