I had the same problem. Turns out my gloves were too tight around my knuckles (they fit perfectly otherwise), making me overwork the grip and causing a lot of pain. Got new gloves, no more pain.
:Sport:
Oooooooooooo, what a ...! I donno why guys go for the biggest bike they can find. A couple of weeks ago I saw a bloke drop a BMW 1150GS and domino six other bikes... priceless.