There are a few companies that make "lift" kits that raise everything (seat, tank, ect) up 1 or 2 inches. That might give you some room. Personally I think they make the bike look kinda funny, and part of having a "pit bike" is being cramped and uncomfortable :D Anyways you could also get a +1 frame as well to open the cockpit up to. Or like Patman said maybe sell this and get a mid-sized KLX or CRF70 style bike such as an SSR150TX or Pitster Pro X4R or the LXR just as examples.