Actuation system and method for a downhole tool

A well tool actuation system 30 for use in a wellbore is described that comprises a valve 40 disposed within an internal flow passage of a downhole tubular and arranged and designed to move between a first position sealing a port in an inner wall of the downhole tubular and a second position permitting fluid flow from the internal flow passage into the port, the valve having one or more passages therethrough to permit fluid to pass axially therethrough to a downhole drill bit regardless of the valve positions, a motor 82 disposed within the internal flow passage of the downhole tubular to permit fluid in the internal flow passage to pass therearound, the motor coupled to the valve and arranged and designed to move the valve between the first position and the second position, and a downhole receiver coupled to the motor and adapted to receive a signal from a remote location, the signal controlling one or more operations of the motor to move the valve between the first position and the second position.