yea, you read it right.
Today, after about a 45 minute ride with a couple stops of about 10 mins total time, I parked in the local shopping mall and went in to kill time (needed to be away from a house full of kids for a while).
Now, engine was obviously fully warmed up (fan cycling normally, temp never over 1/2 on gauge).
ambient temp around 80-84, sunny, no clouds, light breeze, but nothing to write home about.
came out from mall after around 45 mins, walked up to the bike and hear a hissing.. Knowing the cap will vent if pressure is built up, didnt think much about it. until I realized it was doing it after about 5 mins while I was getting ready to fire up the bike. Opened cap, yup, pressure, and I can see the gas boiling! Yes, bubbles and all. needless to say, when I closed cap, hissing started again.
Looked around for any gas on ground/engine/carbs, didnt see any, so when ahead and tried to start. didnt start as easily as normal (didnt want to start at all really). NOT like the no start when hot I normally get (which includes the backfires), this was like I was out of gas. after a couple tries over a couple of minutes, it sputters to life, and ran pretty normally.
stopped about 1/2 way home (20mins of ride) and check it again (not boiling, so the air flow cooled the tank enough to stop the boiling). let it soak in sun for about 20 mins, and checked again.. no boiling.
I am assuming the issue was just a combination of temps/sun and fully warmed engine causing it. Anyone else have a similar experience?