A prominent lawyer killed in a quad bike accident was at the centre of a legal battle by motorcycle company Honda to fight the introduction of mandatory roll-over bars.

Emergency services found the body of Melbourne barrister Ross Ray QC pinned under a quad bike on Sunday after they were called to his hobby farm near Mansfield.

A police spokeswoman confirmed that a report would be prepared for the coroner, while WorkSafe Victoria would also investigate the accident at the property on Hearns Road in Merrijig.

In 2005, Mr Ray appeared in court on behalf of quad bike maker Honda in a legal bid to dismiss a coroner from an inquest into a spate of deaths in Victoria and Tasmania involving quad bikes.