Suzuki's Aleix Espargaro was left with an overriding feeling of frustration after struggling to find a comfortable set-up with the GSX-RR at the Sachsenring during free practice on Friday.

Espargaro managed to set the sixth fastest time in FP2 but said he was disappointed, citing problems with turning the Suzuki in the German track's tight corners.

"I have to say that I'm not really happy because today it was a difficult day for us, I couldn't find a good compromise with my machines as we did in other races and I struggled a lot to make it turn as I wanted," said Espargaro.

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"In the afternoon we made some big changes to my number 1 bike, but they proved to be ineffective; we tried with bike number 2 to be more competitive but the time was against us.

"At the end of the day we found a good direction to work on, so far I'm not really happy, but I'm confident that the info we got today will help us to make some steps forward tomorrow."

Espargaro's fastest lap of 1m 22.095s was 0.4 down on Repsol Honda rider Marc Marquez's lap.

His team-mate, Maverick Vinales, also found it tough to find a strong set-up with his GSX-RR as the championship rookie ended the session in 14th place.

"I'm not happy with today, I couldn't find a proper set-up that made me feel confident," said Vinales.

"We worked hard but we are still far from the top. This morning we spent a lot of time finalising the settings of the electronics, but we still suffer. I miss some traction from the rear and this prevented me from making a good fast lap.

"For tomorrow we need to see the data and try to find some new solutions in set-up and electronics that could make me more comfortable on the bike."