Bobs Machine Kick-Back Jac Plate The Bobs Machine Kick-Back Jac Plate, aka Stump Jumper provides a 45 degree tilt up kick up for motors up to 115 HP. Delrin rollers and bearings provide a long life of smooth operation and pivoting without the need for chains or springs like other jack plates. Integrated locking pins prevent the plate from kicking out when in reverse or while trailering. This unit is rated for outboard motors up to a maximum of 115 HP. Do not encounter obstructions at speeds over