Breaking land-speed records tends to be a fairly difficult proposition. The multitude of venues for doing so nowadays has opened up the opportunities for record breaking, but has also attracted more racers going after records, ratcheting the speeds up higher every year. So it'd probably make sense to find a fairly old, fairly obscure record to break. Something like the land-speed record for steam-powered motorcycles, which was last set 118 years ago.

Or thereabouts. According to Stanley historian Jim Merrick, steam-vehicle pioneer Sylvester Roper had been timed at record-setting speeds atop his Columbia bicycle fitted with a steam engine at least twice in 1896-once at 27.07 MPH and then later during the last lap of a race at Charles River Park in Cambridge, Massachusetts, at 32.4 MPH-and he claimed to have once hit 40 MPH with his motorcycle on a straightaway south of Boston. Roper died that year while atop his motorcycle during a race, apparently from a heart attack.

See the records of steam-powered cycles on Hemmings.