Skerries rider Derek Costello is stable in hospital after crashing at the Dundrod 150 road races on Thursday.
Costello was injured in a crash at the Flowbog section on the final lap of the opening National Race at the County Antrim circuit.
He was taken to the Royal Victoria Hospital in Belfast and treated for trauma to the head.
On Friday evening, an update from race organisers said his condition had improved from critical to stable.
Costello has been moved from the intensive care unit to the high dependency unit at the Royal Victoria Hospital.
Later on Thursday, racing at the Dundrod 150 meeting was called off because of the conditions on the 7.4-mile corcuit.
The Superbike event was abandoned after one lap.
With concerns about the surface and visibility, riders held a meeting before the start and Keith Amor opted not to race.
Guy Martin was nine seconds ahead of Ryan Farquhar after lap one but as conditions got worse the race was stopped and later called off.
Ian Lougher was declared the 125cc winner after just two laps.
Wayne Hamilton was the Supertwin winner with Andy Farrell topping the Supersport 400 timings.
The Ulster Grand Prix road races are due to he held on the same circuit on Saturday.