stalls on take off

[Scorpio65]

This happened last summer when i got the bike and I thought it was just me being a newbie. But its starting to do it again. When i take off from a light or stop sign it will stall like its running out of gas or something. It only seems to do it when its warm/hot outside. I rode all winter and had no problems at all. and I haven't changed the way I ride. Its fine on the freeway.
So what do you think? Its a 2001 GS500 40,000 miles, It stalls on take off from a light, but not all the time, and only when its hot outside. Its been in the upper 80's to the low 90's... I'm at a loss

[LimaXray]

When was the last time the valve clearances were checked?

[finmac]

Do you get the rpms up to 3.5 to 4.5k and slip the clutch? If its sputtering on ya, ease up on the clutch and give the throttle a good couple of twists to get the revs back up and then take off.

-Fin

[scratch]

Check battery fluid level, too.  And connections.