The carberator main jet is very likely partially clogged.
The carb will have to be accessed. With the auto throttle assembly this
can sometimes be challenging.
Some of the suitcase generators, you can remove the float bowl while still bolted up.
The main jet (very small), is threaded
sideways, (not up inside) in the carb body.
Remove that jet or at least push a fine piece of wire thru it to clear it.
Some brake cleaner sprayed thru the orifice would also be helpful.
For a cheap shortcut that MAY work. Put in a very heavy dose
of Seafoam in the fuel. Get the machine running to work the SF
into the carb. Let it sit overnight and then run some more.
Over mixing won't hurt anything.
.