Australian Casey Stoner has turned around his wretched luck to win the Malaysian 125cc Motorcycle Grand Prix at Kuala Lumpur's Sepang track, just six days before his 19th birthday.

He withstood the race-long pressure of Italian Andrea Dovizioso, who clinched the world title in flashing across the finish line second.

Stoner gave Austrian manufacturer KTM its first victory in GP road racing.

However, it was Stoner's second victory his first was in the final race last season, in Valencia, Spain, on an Aprilia bike.

He will now fly to Melbourne for next weekend's Australian round of the championship at Phillip Island, with the final race again at Valencia at the end of the month.

Stoner had been a title contender this year until mid-season when he broke a collarbone and missed two races.

He had not scored a championship point since the Brazilian race in Rio de Janeiro in early July due to a combination of injury, crashes and mechanical woes.

However, he consistently remained among the frontrunners in races, just dogged by bad luck.

"Everything has worked out eventually," a relieved Stoner said.

"I should have done it so many times this season but lucked out. "It shows you, just keep going, put your head down. "I did not have as good grip and power in the last few laps today (so) I backed off to give him a false sense and held on to take the win." It is the first motorcycle GP victory by an Australian this year.

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