LCR Honda's Stefan Bradl was scathing in his assessment of track conditions at the Termas de Rio Hondo circuit in Argentina after the first free practice sessions on Friday.

Bradl, who was one of the riders who participated in a test at the venue last year, was fourth fastest nonetheless behind Repsol Honda's Marc Marquez and Dani Pedrosa and NGM Forward Yamaha rider Aleix Espargaro.

The German rider, however, was far from impressed with the preparation of the circuit, saying: "As expected the track is not in a very good shape, like the test. It was quite dirty this morning but slightly improved in the afternoon. We lost a lot of tyres because we could only do two, three, four laps on the tyres.

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"After that the tyre was too worn and we couldn't work on the settings. A new tyre is a minimum two seconds faster.

"In these conditions it's extremely important to save tyres for the next days to be in a good position for qualifying and the race," he added.

"We need to push because as soon as we put in a new tyre we have to work on many things at the same time. Unfortunately the people here did not do a good job with cleaning the track.

"So far we did a positive job setting the fourth [best] lap time. Let's see how the track will be tomorrow."

Bradl's time of 1m 40.189s was 0.325s behind Espargaro in third and 1.578s down on Marquez.