The Senior TT is unlikely to start before 3.00pm after poor weather on the Isle of Man forced organisers to delay proceedings.
The blue riband race, which will conclude the 2011 Isle of Man event, was due to start at 12.15, but the current re-scheduled time is 5.15pm, with the race being run over six laps. However, this is subject to change.
The Milestones of the Mountain Parade will now take place at 2pm.
Weather concerns prompted Wednesday's second Supersport race to be delayed until the following day.