Marlboro Ducati's Casey Stoner is still struggling with the pain in his left wrist but managed to set the fastest time on day two of the MotoGP tests at Malaysia's Sepang circuit.

The young Aussie is only able to ride for a couple of laps in succession before having to pit-in for a break and this isn't helping him to sort out the setup of his Desmosedici.

“The wrist is giving me a lot of problems and I can’t manage more than two or three laps at a time, so it’s difficult to work on set-up because I’m having to break off too often," said Stoner.

"We’ve still managed to do some work on improving the feeling on the GP9, with some changes to the rear set-up that have improved the bike in the area we were suffering the most. Now it is much easier to ride. I still can’t ride how I want though and we really need to string a run of consistent laps together, although I know that if I can get a little closer to 100% fitness that problem will be resolved.

"Hopefully the wrist will feel a bit better tomorrow so that I can try and do a longer run and confirm the positive feedback we’ve had from the bike today.”