They are located inside the carb itself. After you pull the carb off, blow some compressed air at the input (where the rubber line connects up) and it should hopefully clear out the system.
As mentioned in the other active Kohler thread, make sure to also check the fuel filter as it could be blocked and need to be replaced. A good way to check fuel flowage is to pull the line off comming from the carb, angle the hose into a gas can, turn on the fuel and you should have a steady flow of fuel come out.