Could be something silly like an air bubble in the coolant system. My bike has seen 226* on the guage (Ca to AZ in the summer) felt the heat coming from thru the seat. I was and Jeans and it was bearable.
This will be My Next Helmet
Shark Speed-R Helmet - Solid - RevZilla
The Shoei GT Air is designed for an upright/naked bike seating position so that is something else to consider:
Shoei GT Air Helmet - RevZilla