Is it an 2005? I know of two pwople that had a problem with their tranny's when under a load like that. The dogs on the gears wore down and he lost 1st-3rd gears. They would work fine , until put under a load then the motor would rev up (like in neutral) and the tranny did not engage. Both had to be tore out rebuilt $$$. The were both 2005 S models.
I CAN CRANK IT UP RIGHT NOW AND THE OIL WILL START TO LEAK INTO THE AIR BOX AND IT WONT STOP UNTIL I TURN THE BIKE OFF!! 