The British Horseracing Authority (BHA) wanted to determine if the reported comments at a Gloucestershire event prejudiced racing's "good reputation".
The original hearing was postponed on 3 April to allow Llewellyn's solicitor more time to prepare his case.
Llewellyn had faced a maximum three-year ban from the sport before being given the fine.
The authority said the alleged comments were made at The Hollow Bottom pub in Guiting Power on 10 March.
Llewellyn, from Wantage in Oxfordshire, has ridden more than 500 winners to date, including five at Cheltenham's National Hunt Festival.
He triumphed on Party Politics in the 1992 Grand National and won the race again six years later riding Earth Summit.
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