Casey Stoner will call it quits on his V8 Supercar experiment at the end of the year and is set to take a break from all motorsport in 2014.

Two-time world motorcycling champion Stoner, who has been racing in the second-tier V8 series this year for Red Bull Racing, says he will end his brief flirtation with car racing at the end of the season.

But the prospect of the 27-year-old returning to MotoGP in 2014 appears remote.

The most likely scenario is Stoner will take 12 months off, and any return to the sport in which he won two world championships before his shock retirement last year would have to wait until at least 2015.

"I will probably do some car racing here and there in different times," Stoner told a function in Brisbane on Friday as he made it clear his brief fulltime V8 career was coming to an end.

"To be honest, after this year, I realised I want to get away from competition for a little while."

Stoner has struggled for most of the year to handle the transition from two wheels to four.

While he had quick laps in practice and qualifying occasionally and managed a top-five race finish at Queensland Raceway in July, much of his racing has been at the back of the field.

He crashed out on the first corner at Winton last month, before finishing mid-pack in his other two races.

Stoner was not considered for a co-driver's spot for this year's Bathurst 1000 in the top-tier V8 championship.

A Red Bull Racing source was saying little on Stoner's future on Friday.

But he said the team expects Stoner to see out the remainder of his one-year deal, which involves second-tier series races at Bathurst in October and the Sydney 500 in December.

Stoner fuelled speculation about a MotoGP comeback when he tested for Honda in August.

He blamed his retirement from MotoGP in large part on finding the circuit life too demanding.

Similar gripes have dogged his time in the V8s, with Stoner making it clear he dislikes the heavy round of media and sponsor commitments involved with motorsport.

AAP