hmm, can't find the link actually but i guess i saw a warrior with big bore kit, engine internals and chaindrive doing 160 mph on the salt. i think he got some record for naked pushrod aircooled two cylinders or something...
found it:
Team Bozeman
just a smaller pulley. no chaindrive. but 2into1 pipe, small fairing, rearsets, bak and big bore seem to be a good setup...
http://www.team-bozeman.com/custompage2.asp?pg=BonnevilleRacingTeam