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I would reset the TPS and do a throttle body sync. It sounds like it is just a touch lean (or rich) at that temperature.It may also be a sticking idle stepper motor.Also, double check the stark plug gap. Everything may be struggling in those conditions and a bit too much gap may just be enough to prevent it from firing.
These plugs on my 2013 Stelvio (Ngk CR8EKB) are dual tab type plugs so I donít think I can adjust change the gap?? Maybe I should order some single tab (NGK PMR8B) which are also recommended for the Stelvio. Single tab would be able to set gap.
Double electrodes are throw away, more expensive single trode is reusable & cost less in long run.
Checked valve lash lately? Not wanting to start when hot is a sign of tight valves.
Got software Bob?
I will say again cause it seems like others are agreeing with me...Any time I have had issues losing idle when hot or getting no start when the bike was hot (but I knew the carb jetting/ecu tune was correct), the culprit was tight valves. I have never had a 8v bike, but seems like this is a simple and quick check that costs zero dollars
As has been stated several times and recommended by numerous folks, when itís hot youíre likely to be getting some level of vapor lock. Open the gas cap and let it vent a few seconds and try againÖCertainly check the valves too but if it was running fine Until the day you rode it on a hot day, then itís unlikely to be the valvesÖHighly recommend learning Guzzidiag also as well as getting a quality throttle body equalizer (Carbtune or Twinmax).
I encountered hard hot start problems on a few bikes. Every time it's been coils, and, every time the problem coils checked out OK with basic multi meter testing. Go figure, eh.
As has been stated several times and recommended by numerous folks, when itís hot youíre likely to be getting some level of vapor lock. Open the gas cap and let it vent a few seconds and try againÖ
Unless the sparkplugs have 150,000 miles on them or were fouled by poor fuel or oil burning they are not the problem. Modern sparkplugs are not the crappy AC Delco's of the 1970's. They last a looooooooog time. If they are iridium you'll get tired of the bike before they are worm to the point of needed replaced.
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