Motorcylist Shaun Harris was airlifted to Christchurch hospital after an accident on Saturday.

A 50-year-old motorcyclist remains in a critical condition in Christchurch Hospital this morning after coming off his bike at the Timaru International Motor Raceway.

Canterbury District Health Board spokeswoman Amy Milne said on Sunday morning Shaun Harris remained in the hospital's intensive care unit.

He arrived at the hospital in a helicopter about 2pm on Saturday.

ANDY MCGECHAN/FAIRFAX NZ New Plymouth man Shaun Harris, pictured in December, is in a critical condition in Christchurch Hospital after being thrown from his motorcycle at the Timaru International Motor Raceway.

An eyewitness said nobody else was involved in the accident at the Levels raceway about 11.45am on Saturday. Harris, an experienced rider, was thrown from his bike after high-siding a hairpin turn.

In December, Harris said he was using motorcycle racing as a tool to rebuild his confidence and health after a serious accident at the Isle of Man road races in 2007.

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Harris made a late entry in the Twin Pro class in round three of the New Zealand Superbike Championships in Timaru this weekend. He was on the second lap in the Twin Pro series practice when the accident happened.

Medics worked on him for over an hour and a half before he was taken by helicopter to hospital.

South Canterbury Motorcycle Club is hosting the championships' third round.

Racing was scheduled to resume today.

Club captain Aaron Cordell declined to comment on Saturday.