The collision happened just after 11am on Saturday 3 August 2013 on Limekiln Bank on the B6265 prior to the junction with Studley Lane.
The motorcyclist, a 60-year-old man from Lancashire, was travelling towards Ripon when he came off his bike and sustained fatal injuries.
No other vehicles were involved in the collision, however, officers believe a deer, which was found deceased at the scene of the crash, ran out from the side of road and may have caused the rider to fall off.
Police are appealing for anyone who saw the white BMW motorbike travelling along the road towards Ripon before the crash as well as anyone who saw the actual collision, to contact them.
The air ambulance attended the incident, but sadly the man was pronounced dead at the scene.
The road was closed to allow emergency services to deal with the collision and carry out a full examination of the scene. It reopened at 2.50pm.
Anyone who can help the police investigation is asked to call North Yorkshire Police on 101, select option 2 and ask for Traffic Constable Rob Roberts. Or you can email firstname.lastname@example.org