That's from too much weight on your wrists and hands. Possibly too tight of a grip as well.
A change in body/riding position is needed to improve it.
Heli-bars and a .75" spacer combined will help.
I traded my gen2 years ago(owned it for 3 1/2 years). I loved the engine, but never could get comfortable in the riding position.
I personally find the gas tank to be too long, between the seat and bars. My lower back didn't like the reach. I did several bar and spacer combos, and finally a Spiegler dirtbike bar conversion.
My back didn't like any of it.
My point is, through All the changes and combinations that I tried of seats, bars, pegs, to try to fix back pain, I noticed the numb hands and wrists(that ached really good) improved as the bar position fit My body better.
I didn't/don't have any comfort or pain problems on a 1k. As it fits me better.
You need to ride a bike for a while to get a feel for it, and your riding position.
And the new aches and pains usually improve quickly with seat time.
If they don't, it's time to make modifications to improve or fix the issue.
Good luck with it.