There is no obvious explanation as to what led an experienced racer to crash during a practice session during last year's Festival of Motorcycling.
Northern Irish rider Stephen McIlvenna died after coming off his Yamaha near to the Mountain Box on August 19th.
The inquest into the County Antrim man's death was officially closed yesterday with the Coroner of Inquests recording a verdict of misadventure.
Witnesses who were at the scene gave evidence in court saying whilst they didn't see the bike lose control they did see the aftermath of the collision.
One marshal described seeing the rider "cartwheeling" through the air before hitting the wall - saying the whole thing took less than 10 seconds.
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