Our old friend, AJSB, posted this over on thumpertalk... FIM looking at dropping mid-bore class from 450cc 4t to 350cc 4t...
http://www.motorcycledaily.com/23december07_why350.htm
I would like someone to build a long stroke and bored version of a 250 to give me a 325 4t with 250-like weight... I think that new gasgas trials motor with 320cc displacement (keep the long stroke, please) and six speeds would be a very fun ride - and very, very light... It probably wouldn't win a drag race but get in the tight stuff and walk away from anything without a drop of sweat expended in the process... That motor looks like it weighs less than an xr200 motor...
jeff