My friend was in deep talks with Mike Walsh for this bike. They left it in the 50's hp because it had plenty of torque and HP for the application. Walsh did all the motor work. It was inserted, new oem crank. all new bearings and such, and a Full Hinson  (basket and hub). They were offered $18k for it and declined, Now one of the TRX guys owns it and is racing it. He has said what he paid for it. But im gonna say it was over 18.