A motocross exerciser having a motocross handlebar assembly with a rotatable throttle grip and brake levers under tension which can be utilized to build up hand and wrist forearm strength. A master interface having a display is employed in the system to help a user control and manage the vehicle functions. A scanning system moves the stimulable phosphor sheet with respect to the linear stimulating ray source and the photoelectric read-out system and in a direction, which is approximately normal to the length direction of the portion exposed to the stimulating rays. The condenser assembly base is positioned on the pad to cover the nuts on the stabilizer rods to make the nuts inaccessible once the condenser base is in place on the pad.