Suzuki rookie Maverick Vinales slashed his Sepang lap time by 2.2s during last week's MotoGP test.

That put the young Spaniard twelfth on the timesheets, just two places and less than half-a-second from experienced team-mate Aleix Espargaro.

"I'm very satisfied. We worked really well. We started the test in 2m 3s and we finished in 2m 0s. So we are happy. We are also quite surprised. The bike works really well with the soft tyre and with the medium tyre, so I think we can have a really good result if we improve the engine.

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"I know the bike better now and I tried to understand the tyres because in Moto2 you had 12 laps to make a really good lap, but here if you don't make it in the second lap you don't make it. It's difficult to change this in my head but we improved step-by-step."

He added: "I don't know the limit. I don't know how much I can push the front on the brakes. This is difficult to understand at the moment."

One area where Vinales is already gelling nicely is the chassis: "It's quite good, smooth and I can make my own lines, so I like it."

Meanwhile the known lack of engine output for the GSX-RR, plus rear grip, are the most pressing issues.

"At the second test we want to work also on the engine. It is the part that where we lose a lot, but also we need to improve the grip in the rear because it is so important that you don't have too much spinning.

"I don't use the electronics so much. I was quite close to nothing. I feel good like this. If they put [more electronics] I don't feel so good. I prefer to control [the engine] with my hand."

Vinales, 20, won the 2013 Moto3 title then took four wins as a rookie in Moto2 last season to secure the factory Suzuki deal.

"So much is different," he said of MotoGP. "In Moto2 you can go 300% and nothing happens, but here you need to really concentrate because a small mistake can take 0.3s from the lap time.

"I think you need to be so smooth and really concentrate on everything. The brakes, acceleration. In MotoGP if you are aggressive you are slower."

Only fellow rookie Loris Baz (19th) made a bigger lap time improvement than Vinales over the three days (2.5s).

The second Sepang test takes place later this month.