1998? Would that make it a single cylinder Kohler Command series engine?
Carburetor is new? Is it the exact right original equipment replacement for that model and spec. of Kohler engine? About four times last year our shop was asked to 'fix' a engine with a new carburetor the customer bought online. While most of those carburetors do seem to give pretty good service, there are occasionally some that just don't work right. And in my experience, it is very difficult to pinpoint the reason they don't work. And OEM parts don't fit them most times. Of those four times, only once did we make it work at all and that time the other mechanic just kept drilling the jet bigger until it ran 'fairly' well. Its performance never was something to brag about.
A couple other things to check: Does the air cleaner or any of the gaskets cover any of the small holes in the carburetor faces? Check the flange of the carburetor that bolts to the engine or intake adapter too. And the other thing that messed me up a week ago was the carburetor adapter gasket with too big a main hole in it. This allowed the engine to pull in extra air from the vent passage in the carb. body as the large hole in the gasket was about 1/4 larger than the hole in the carburetor.
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