Send a pm to Hippy on here he'll get you onto the club happenings and he is drumming up a class for minigp which I'm sure he'd accommodate ysr's and metrakits within the 160cc 4t and 85cc 2t rules!! Worst case scenario is you ride with the mini-motards, no biggey!!!
Hey I wasn't so much thinking of full GP bike as such, sorry about that. more along the lines of the smaller metrakit's etc. I'd say mid sized pocket bike , single speed. I picked one up, told it is an X1 or something. Bit bigger and way more room to fit something like a go kart engine if it's been done? clutched of course.