I tend to get a numb right hand if I dont relax and flex it occaisionally - I think it is fairly common and not a problem with the bike itself.
One solution is one of the throttlerocker type things or the ol' Oring in the throttle trick so you can move the right hand and get the circulation back before it goes numb.
I use a crampbuster - simple cheap and effective.
Possibly a sign of old age?
My brother rode his Honda 1000 for 2 days straight and had numb tips to his fingers that took about 3 weeks to come right - it cant be good for you when you let it get that bad.
Grant