Valentino Rossi is hoping to make more inroads into day one pacesetter Marc Marquez during final free practice and qualifying at Brno on Saturday.
Rossi was fifth fastest in the dry session in the morning with a time of 1m 57.065s, which put him 0.262s behind Repsol Honda's Marquez.
However, in the wet conditions in FP2 in the afternoon, the Movistar Yamaha rider was one second down on Marquez and Dani Pedrosa and says he will need to find more to close the gap if the rain continues to fall this weekend at the Czech circuit.
“This morning we rode the bike with the dry tyres and dry setting. Unfortunately we had some rain this afternoon. It's a shame because we have to try something to improve the setting, but at the same time I did get to do some laps in the wet,” said Rossi.
“I tried the bike with the wet tyres and the first impression was not so bad, but we have to work to improve.
“We have to prepare the bike as soon as possible because we lost one practice session and need to have a clear idea of what we will do in case of a wet situation. We have to work with the team and be ready for tomorrow,” he added.
“In the wet conditions we lose a little bit in acceleration. The problem is that my rivals are one second faster. It looks like they are very strong.”