STARTED MY '07HARLEY DAVIDSON FLHTCU AND BACKED OUT OF PARKING STALL, BIKE WAS ALREADY IN 1ST GEAR, STARTED TO RELEASE THE CLUTCH TO MOVE THE BIKE WHEN THE ENGINE WENT TO FULL THROTTLE WITH NO INPUT FROM ME. THE BIKE LURCHED FORWARD SO I IMMEDIATELY TWISTED THE THROTTLE OFF AND APPLIED THE FRONT BRAKE BECAUSE I WAS HEADING FOR A CURB. AGAIN THE ENGINE WENT TO FULL THROTTLE ON IT'S OWN. THE BRAKE HAD NO EFFECT SO BEFORE I HIT THE CURB I RELEASED THE BRAKE AND STRAIGHTENED THE BIKE SO I WOULD HIT THE CURB AT A RIGHT ANGLE AND WAS ABLE TO AVOID A TREE. THE BIKE FLEW ABOUT 4-5 FT AND LANDED ON GRASS. I TRIED TO REGAIN CONTROL OF THE BIKE BUT DESPITE MY EFFORTS THE ENGINE REMAINED WIDE OPEN. I PULLED IN THE CLUTCH BUT THE BIKE SWERVED IN THE SLIPPERY GRASS AND WENT DOWN ON IT'S LEFT SIDE. THE BIKE RIGHTED ITSELF AND KEPT GOING BUT FELL IMMEDIATELY AGAIN ON THE RIGHT SIDE. THIS SCENARIO REPEATED ITSELF ONE MORE TIME FALLING ON THE LEFT SIDE ONLY THIS TIME IT FELL MORE VIOLENTLY AND EJECTED ME INTO THE DIRT. AS I WAS LAYING THERE I HEARD MY MOTORCYCLE ROARING AND SAW THAT IT HAD FLIPPED OVER ON IT'S RIGHT SIDE ABOUT 30 FEET AWAY AND WAS LAYING PERFECTLY HORIZONTAL WITH THE REAR WHEEL SPINNING. THE BIKE WAS SLOWLY TWISTING ON THE GRASS FROM THE TORQUE OF THE ENGINE AND I HAD A MOMENT OF FEAR THINKING THAT IF THE WHEELS DUG IN AGAIN THERE'S NO TELLING WHICH DIRECTION IT WOULD GO AND I COULDN'T MOVE. I TRIED TO TWIST MY BODY AROUND TO PUT MY FEET TOWARDS THE BIKE AS MY ONLY