A misadventure verdict has been recorded at an inquest into the death of veteran Manx Grand Prix rider John Goodall.
Coroner Michael Moyle heard the 67 year-old was thrown from his machine after skidding on oil at Ballacraine during this year's Senior Classic race on August 25.
Witnesses said they saw oil on the road, but no flags indicating a spillage were displayed.
Seven witnesses gave evidence, including competitor Bill Swallow who confirmed his bike left oil on the course, which led to Mr Goodall losing control of his machine moments later.
Three marshals based at Ballacraine explained separately how the "lack of adhesion" flag was not used until after Mr Goodall's accident, although the general warning flag was displayed.
Two spectators from England said the oil leak was obvious to them.
There was criticism of a lack of hay bales at Ballacraine, but Mr Moyle emphasised that no one was to blame for Mr Goodall's death.
(Picture: Douglas Courthouse, where the inquest was held).