Hot Weather Start Problem

So , we hit hi temp. in Chicago.
After parking my bike on parking lot , after work I have problems with idle just after start.
Basically, bike is running on very low rpm and finally stalls. Rev rpm doesn't help.
I don't have problem to start it in the morning or colder days.
Bike has 85k on odometer and very good maintenance record by previous owner.

Happens here in the desert from May to September. The fast idle/choke setting is not engaging. Manually keep the revs up and go ride. Once bike is at operating temp should idle normally.

Bump your idle adjustment........a little.

T

Thanks , hope it is nothing major.
is fast idle/choke setting fixable ? How difficult ?