The other part of the company logo, the "Thumbs up" symbol, came after Sr. Bultó witnessed British motorcycle racer David Whitworth giving the signal to his pit crew to signify that all was well.In 1998, rights to the Bultaco name were purchased by Marc Tessier, who used it to help launch a range of purpose-built trials motorcycles from his company Sherco Moto S.A.R.L.The US trademark is now owned by HDW Enterprises, parent company of a parts and repair specialist for vintage Bultacos.Irish trials ace Sammy Miller teamed with Bultó to produce a lightweight, two-stroke machine, which, overnight, rendered the heavy four-strokes obsolete.This coincided with, and perhaps stimulated, the growth in the popularity of trials in Europe and later the USA, which provided a lucrative market for Bultaco in the years to come.The Bultaco Astro was a very popular short-track racer in the United States, and was used by many AMA Grand National riders in the US in pursuit of their championships, including Mike Kidd, Terry Poovey, Bubba Rush, and hundreds of other top-class competitors.[1] Sherco motorcycle company , founded in 1998 in Barcelona, derives its name from an amalgamation of two words, Sherpa and Bultaco.