Generac ix 2000 does not start. checked spark plug and it is good. oil good.

Rated output is at full load. Units will produce power up to that limit and use gas accordingly. Very lite load = less output and less gas consumption, etc.

Possibly blockage in fuel tank or line to carburetor? Fuel filter?
Fuel turn off valve? Generator malfunction that pulls the kill switch?
Owner's manual trouble shooting?
No manual try for owners and repair manual http://www.manualslib.com/

get the OBD codes read to point to the problem switch/sensor or circuit

Change the breakers in the gen

Contact the Generac repair/service foks at:

Unplug the oil sensor.
The oil sensor is located behind the oil filter. I unplugged the oil sensor and it fired right up. Plugged it back in and it runs fine.
It might be because it is cold.
I don't know why but I turned it off and it starts right up now.

Hello Here is website for help with you generator: Generac Power Solutions Service and Support Online Product Support...

old gas or water drain system replace gas

YOU NEED TO AJUST THE FUEL MIX ON THE CARBURTOR

It sounds as though there is an issue with the carburetor. If the unit is "surging" with no load I would recommend thoroughly cleaning the carb. It would also be a good idea to test the fuel pump. Per Generac you need to disconnect the fuel line leading to the carb and pull the starter rope over to see if adequate fuel is flowing. If none of this is the issue try testing the stepper motor on top of the carb. If you unclip the wire and use an OHM meter all wires should test at 150 ohms. to test place on test lead on the blue wire and move the other lead to the remaining four wires. The should all ohm out to roughly 150ohms. if this is not the case you need to replace the stepper motor.... Before you do any of this you should check for fresh fuel, a good spark plug, and proper compression.