I got 2 curb rescue generators. One Chicago Electric 800 watt and a nearly identical ETQ TG1200. Got them both running after some major cleaning. The. Chicago one has one screw on the carb for idle adjustment. The other port is sealed. On the ETQ has 2 screws, idle and another (same location as blocked port on Chicago) that I'm assuming is mixture. My question is how to adjust this possible mixture screw. Running it in and out seems to have no effect on running.