Kulraj Singh Kalsi died from a severe head injury after the crash in Dewsbury, a minster town in the metropolitan Borough of Kirklees in West Yorkshire, in April last year.
Kalsi's motorbike struck the passenger side of a van while it was entering into a compound, Kirklees Coroner's Court heard.
An eyewitness told the inquest he had seen Kalsi and his bike go 'airborne' following the collision, The Examiner reported today.
Investigators suggested that Kalsi's vision may have been affected by wind and drizzle as he was not wearing a helmet or a visor.
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Coroner Mary Burke concluded that Kalsi had died as a result of the accident.
"There's no evidence that suggests Kulraj was slowing down as the vehicle was beginning its manoeuvre and it's not possible to say why he was in the position he was," she said.
Burke said Kalsi, who had epilepsy, may have suffered a seizure before the crash.