MotoGP world champion Casey Stoner was credited with the fastest lap time during Friday practice for the Valencia finale, but changeable wet conditions meant Stoner felt little had been accomplished.
The Australian was fastest thanks to his pace-setting morning time, before dropping back to eighth in the wetter afternoon session.
"It hasn't been a great day to be honest, we've never had a great feeling here in the wet," said Stoner. "I love riding this circuit in the dry, but there seems to be some sort of oil or grease on the circuit. I'm not sure if it's due to a lot of car rubber down but it makes things hard for sure," said Stoner.
"It's been pretty useless in terms of finding a good set up, both sessions began with a little water and then drying out towards the end, when it's like this you're chasing the set up all day so we didn't do too much work on the bike.
"We tried a few small things to make it better in the wet, but then as it dried up we saw everything we had done was a waste of time. We'll wait and see what tomorrow brings and if it does rain again I hope it at least rains consistently so we can get a full wet session in."
Second fastest was team-mate Dani Pedrosa, who was also one place behind Stoner in the afternoon.
"This morning we had a very good run, but in the afternoon we had some issues on the bike with the rear shock and I only managed a few laps, spending a lot of time in the garage making changes," he explained. "The track surface is quite old and very slippery, even when the track was drier it was still tough.
"The feelings are not so bad and I think we need to be ready for mixed weather conditions, improving the set up step by step. Let's wait and see if tomorrow we have some dry sessions to get out on slick tyres, this would be important to better understand the direction to take on the set up of the bike".
Fourth in the championship Pedrosa starts the final round four points behind team-mate Andrea Dovizioso, who is taking part in his last event for Honda before joining Tech 3. Dovizioso was ninth quickest.
"Today the conditions of the track were really demanding as there was no grip," said Dovi. "We did good work with the team and we were careful not to make mistakes as we didn't want to take additional risks with these difficult conditions. All in all, I'm quite satisfied as I was able to ride quiet fast without pushing too much but of course we need to keep on working. I hope that tomorrow the weather and the track situation will improve".