Casey Stoner, who sailed into the distance during the recent wet British MotoGP, worked on improving his wet-up still further during the single Thursday practice session at Assen.
The four time 2011 race winner and title leader finished the 45-minute session in third position, 0.491sec from Marco Simoncelli (Gresini Honda) and 0.131sec from Valentino Rossi (Ducati).
The afternoon session was then cancelled due to an oil spill.
"This morning's session was good to get some more data on the wet set up as we still don't have that much experience in these conditions on the RC212V," said Stoner. "We worked on getting the general set-up of the bike a little better and also with the edge of the tyre where we wanted to try and create more heat.
"We concentrated on this in the morning session and the last exit was a little better but unfortunately we didn't have enough laps to warm the tyre up and find any real advantage.
"This afternoon we wanted to continue with this but unfortunately due to an oil spill on track from the Moto2 class we had to forfeit the session and we'll come back tomorrow and see what we can do".
Andrea Dovizioso, second at Silverstone, was once again one place behind his team-mate at Assen.
“This morning I found a good feeling with the bike and we were able to be fast from the beginning. There was not so much grip so between the first and the second exits we made a change to improve this and in the second outing the bike worked better," said the Italian.
"We had planned another change in the afternoon session as we have margin to improve but today we rode well without taking too many risks. It's a shame we couldn't test this afternoon after the oil spill on track but FP3 will be longer tomorrow to recover this time. Depending on the weather, we will continue where we left off today”.
Hiroshi Aoyama, replacing the injured Dani Pedrosa, was twelfth out of the 17 riders.