UPDATE: Marc Marquez beat Casey Stoner's unofficial record Sepang lap time during the opening hour of Thursday's final day...

Repsol Honda's Marc Marquez isn't ruling out matching Casey Stoner's blistering lap of 1m 59.6s during tomorrow's final day of the Sepang MotoGP test after heading the times again on the RC213V.

The reigning world champion took advantage of excellent track conditions in Malaysia to set a best lap of 1m 59.926s.

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Aussie Stoner set his unofficial Sepang benchmark (1m 59.607s) during testing in February 2012 and young gun Marquez has issued a 'wait and see' teaser ahead of tomorrow's third and last day of the opening IRTA test.

"We will see," Marquez responded when questioned on the possibility of getting closer to Stoner's time.

"If you want to attack that time then you must try at 10am in the morning, when the track will be faster. Anyway that is not the target..."

Marquez has joined a rare group of riders to break the two-minute Sepang barrier, only ever achieved in testing.

"I was surprised by the lap time but especially for everybody, because many riders are in 2m 00s and that is impressive because last year only three or four riders did that time.

"This year it looks like the track is quite fast and it's important to have fast conditions to try different things on the bike," he added.

Marquez posted his fastest time using a new HRC chassis and soft rear Bridgestone tyre, even though the Spanish star wasn't feeling entirely comfortable.

"The feeling was quite good. We started like yesterday and then we tried different things; we tried a different chassis," Marquez said.

"In some points we improved a little bit but in another point I didn't like it because it was a little nervous, but even with that I was happy because we got a lot of information.

"The bike was a bit more nervous in the fast corners and I didn't like it, especially in the first few corners where you can win more time. You need to be safe there because it is a fast corner.

"We concentrated on different set-up and different geometry and we improved a little bit with braking stability, but we are still continuing to lose a little bit on corner exit," he added.

"I tested the new rear tyre, soft and hard, and the positive thing is that we are able to use the rear hard tyre, because last year it was not possible. The consistency was quite good [with the hard rear] and it was not so far from the soft one.

"The character of the tyre feels quite similar to the other ones and at the moment I am quite happy because it is working quite good. I did 25 laps with the tyres and I had no problems."

Marquez finished ahead of team-mate Dani Pedrosa in second, who lapped in 2m 00.336s and LCR Honda's Stefan Bradl (2m 00.339s).