New factory Ducati star Cal Crutchlow reduced the gap to Sepang pace setter Marc Marquez by one-second on day two of MotoGP testing.

Crutchlow had instantly improved on his best lap time this morning, running as high as third.

However he later slipped back to twelfth, directly behind team-mate Andrea Dovizioso, with a fastest time - on lap 11 of 48 - that was 1.470s adrift of reigning champion Marquez.

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"We've made some improvements since yesterday, there's no doubt about that," said the Englishman, who spent all of Wednesday on the new Desmosedici GP14.

"We went through a lot of settings. Up, down, left, right. But essentially it's difficult to analyse because the track condition changes from lap to lap, let alone a 30 minute window.

"That's the normal time it takes to make a change and the track has already changed by the time you go back out.

"If the bike had stayed how it felt from 10-11am I'd have declared myself happy. After that every bike starts to feel worse and it seems that's more of a hindrance for the Ducati.

"But I'm pleased that we found some positives, rather than nothing yesterday as such.

"We improved in the braking zone and corner entry, but that's about confidence as well. I need to get used to riding this bike, not the previous bike [Yamaha] because it's a lot different.

"Where we need to gain is to start looking for rear grip and the rear of the bike. We know there's still a problem turning into the corner, but at the moment we can't change that.

"So our prime concern for tomorrow will be to try and find some more rear grip, tyre life and stop the bike from wheelieing."

The former Tech 3 Yamaha rider added that the Ducati seems to respond well to aggression and that he'll push it harder once it becomes more familiar.

"I can't ride this bike anywhere near how I rode the Yamaha. I can't get away with it. Everyone says riding this bike more aggressive works. It does in a way but it's having the confidence to do it," he said.

"Step-by-step I'm learning a whole new electronics system and engine, so I'm not willing to push the bike like that at the minute. So to be not too far from the other Ducatis at the moment is a positive."

Pramac's Andrea Iannone was the leading Ducati rider, in eighth place, on Wednesday.