2007 SUZUKI GSF1250 Power Train Problems

I HAVE A 2007 SUZUKI GSF1250S MOTORCYCLE. WHEN YOU FILL THE GAS TANK AND PARK IT IN DIRECT SUNLIGHT ON A HOT DAY FOR AN EXTENDED PERIOD OF TIME, A PROBLEM OCCURS WHEN THE BIKE IS THEN DRIVEN. AFTER STARTING THE BIKE AND PULLING AWAY IT WILL RUN FINE UNTIL THE TRANSMISSION IS SHIFTED INTO FOURTH GEAR. THEN THE ENGINE WILL LOSE POWER AND SPUTTER AND SOMETIMES COMPLETELY STALL. THERE IS, OF COURSE A SUDDEN LOSS OF SPEED ASSOCIATED WITH THIS CONDITION. AFTER A LITTLE WHILE THE PROBLEM GOES AWAY AS THE ENGINE WARMS UP. THIS PROBLEM IS VERY REPEATABLE UNDER THESE EXACT CIRCUMSTANCES. I'VE READ ABOUT MANY OTHER 2007-2009 MODELS OF THIS PARTICULAR MOTORCYCLE THAT EXHIBIT THIS SAME CONDITION. *TR