Yamaha riders Jorge Lorenzo and Ben Spies said they will go into Assen MotoGP qualifying full of confidence in their bikes after topping a practice session apiece in the Netherlands on Thursday.
Lorenzo led the way in morning practice, while Spies - who won the Dutch TT last year - went quickest in the second session.
Spies is confident he can sustain a strong pace over a race distance this weekend.
"Today was a good day, both this morning and this afternoon," said Spies. "In the second session we did almost race distance on the tyres in case it rains tomorrow to be ready for Saturday. We had quick times and then tried the soft tyre at the end of the session and were able to put down some quick laps with over race distance on the front tyre.
"The bike feels good so we're going to continue on this path and try to make the bike even better for tomorrow and Saturday."
Lorenzo was only fifth quickest in the afternoon, but said this was due to tyre tactics.
"The feeling is pretty good with the bike, we started in a good way this morning and were fastest," he said. "In the afternoon we were fastest for most of the session but finally the riders who switched to soft tyres went in front of me.
"We concentrated on improving the pace with a race tyre and I think we succeeded. We have a good package and I'm confident with the bike which is important."