Colin sorry to correct you but Carl didn't build the motor for Stew all he did was dyno the bike. The motor was all stews own work. As for Carl's motors look at his web site in the winner enclosure. A motor by carl is cheap compared with other so called thumper experts. Budget a minimum of $2,000 just for genuine yamaha parts add another $1,000 for H/P parts(rod, piston, cam, valves etc) allow a $1,000 for labour. Curly