first is to relax your grip which should do the trick, then you can try bar-ends, then there's filling your bars up with BB's or sand or that BarSnake/tm thing or any sort of wieght/counterweight idea. then there are different bars to suit your ergos better. but first try the loose grip thing.
others should have better tricks 'cause numb hands/fingers usually just mean that i'm doing something wrong...as opposed to the bike...from my POV.
Yea thanks Hack I think I am going to switch to a 18 front and a 32 rear using 520 chain and sprockets. But yes Unga there is a large design flaw with the motor i want to get it rephased to 277 but its pretty pricey.