If you want an affordable bike you make go lots faster, aquire "tuning for speed" & a Ariel Arrow. the work you can do with a file to the ports & to the pistons with a ball pein hammer is wonderfull, but the brakes are a different matter, but the bike is so light you probably dont need brakes, (the last one I built was a proper "sport" Arrow,flyscreen, red cables, white & gold-not a golden arrow-200cc) the heavy mod was 2 1"/16 wal philips injectors, padded flywheels and hacksawed pistons! and knifepointing all the ports. The standard arrow speedo went to 80 mph so eveything else was guesswork but friends on T100s used to say their clutches were slipping!