From the article:

"Mark normally builds a new race engine every winter. And when we say, “builds an engine,” we don’t mean he goes shopping for parts online. He starts with a big billet of solid aluminum and designs an entirely new engine. Apart from the seals and bearings, he makes everything—right down to the cranks, connecting rods and pistons."

Check out the full article here:

http://www.bikeexif.com/bmw-alpha-racing-motorcycle-concept