Dani Pedrosa says Honda must find a solution sooner rather than later as he continues to search for answers to the problems faced by the Repsol riders at the Sepang MotoGP Test in Malaysia.

On the final day, Pedrosa was sixth quickest behind Ducati test rider Casey Stoner, lapping in 2m 01.161s - a huge 1.581s behind Yamaha's Jorge Lorenzo.

The Spaniard is wary that Yamaha aside, Ducati is also posing a threat and with the opening race in Qatar in March looming large, Pedrosa says rapid progress is of the essence.

"I had some seasons in the past when I was struggling a lot with Honda [at the start of the season] but also we can say that other manufacturers are closer, not only Yamaha," he said.

"I guess on the cornering and on the exit of the corner [struggling most]; I was following some Ducatis and the difference into the straight line is quite massive, and as well, the turning in.

"I think we are losing overall, so I think technically it must be related to a big thing - we have to see. There are so many things different on the bike, not only the engine, but also the tyre and electronics," he added.

"We must try to adapt these things as best we can and as fast as we can because it's soon going to be the first race."

Pedrosa admits that he remains in the dark over what changes are needed to find a way forward to reduce the gap to the factory Yamaha riders, but says it is clear from the times that much work lies ahead for his Repsol Honda team.

"Obviously from the feeling on the bike and the time difference on the time sheets, we need some changes. We don't know exactly where to apply these changes or how we will apply them, but we need to," he said.

"It's been a difficult test and we have done a lot of work on the bike. We cannot show the potential of the bike and we need to still work. At the end of the afternoon today I could push the best mixture on the bike, try some tyres and improve a little bit the bike, so we know the situation.

"Overall, I think I'm happy with my personal feeling after the work we have done these three days," he added.

"At the end of the day I tried two [front] tyres, one of them was a little better, the other, no, so I think Michelin need to take a decision soon."