Hanging idle caused by rich jetting?

I'm fixing a buddies 05 WR450. Vortex ignition, FMF full system, AIS removed, 165 main, 45 pilot, fuel screw 1 1/2 turns out and its still got a hanging idle I cant pinpoint. I've done everything other than new fuel (gas is supposedly a week old and smells fresh) and check the valve clearances. I've cleaned the carb completely and eliminated any air leaks. When starting the bike it always starts without the hot start whether the bike is hot or cold. The hanging idle goes away when I hold the hot start in making me believe the bike is running too rich. So my questions are will rich jetting, an exhaust leak at the front of the muffler or out of spec valves cause a hanging idle? I'm asking here cause I know you guys can help me whereas the WR forum is a question mark.

Thanks for the help.

You should ask in the right forum. The problem could be caused by a fault in the air cut valve, and those in the WR forum would be more familiar with that.

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