good luck, a vincent holds it at 109.079 mph. one of my baby brothers goes to bonneville as the pilgrim stubbs team. the flathead harley is 80" and turbo charged, it ran 162 mph. at one time they held the record on a vintage motorcycle but i can't remember if it was a 45 or 80. they are now running a ad chevy truck with a diesel in it. here's a pic of one of the bikes this is the 162 mph bike. they have built some newer bikes but don't know anything about them.
here's a pic of the twin engine monster, i don't know much about it but know they are shooting for 200 mph. the man with the orange hat is the pilot. i do know it is twin turbo charged twin 1937 harley flatheads.