Re: New here.
that doesn't sound right. When you turn the throttle off the needle should almost close the jet even with the idle wrong it shouldn't make that much difference.
I can think of only one possibility
the bolt at the top of the carb on what looks like a buddist temple needs to be adjusted to give more slack to the cable. that also adjusts the carb in a way.
I would try adjusting the nut on top of the carb where the cable runs through though. Start the engine and wind the nut in or out I cant remember which way it goes now. You will be able to tell the difference.
My posts have entertainment value only. A bike ain't yours till it has your blood on it. Then it owns you.