I would be much more inclined to check the choke, it sounds like it's stuck on or at least partially.
Any bike will do this if the choke valves are closed or partially closed even.
You might be surprised that the solution is as simple as turning off the choke (opening the valve) is the solution.
And yes, this would very much so cause the bike to run rich as well.
Good for starting up, not good for running!
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