That would be awesome, I know Honda broke the 200mph speed barrier for Grand prix bikes back in 1993 at Hockenhiem, single crank 500cc V-4 2 stroke said to be making 200hp and naturally aspirated., I would think you could hit 250mph with a 750 inline 4, or a 750cc square 8, although Im not sure how you would sleeve it down and stroke it down from 750cc to 375 cc, that would be like using a YZ 85 or bored to a 93cc with crank and cyclinder set up x 4 = 372cc x 8 = 744cc please share when you feel you have enough leed time from the competitors on your build.