Max Biaggi will need the cooperation of the Assen weather if he is to qualify for Saturday's Superpole session.
The Aprilia star, just four points behind title leader Carlos Checa, was ranked just 17th in both of Friday's track sessions.
Morning practice saw the Roman hindered by 'problems' and he then wasn't able to get up to speed soon enough in the few minutes of dry time available in qualifying.
“This morning we had some problems with the bike that caused us to lose precious time. In the afternoon we started after making some significant changes, but after a few minutes it began to rain and I was forced to come in,” said the 2010 world champion.
“When you make such drastic changes you have to re-familiarise yourself with the bike and unfortunately I wasn't able to build my confidence in the only fast lap I had, so we ended in 17th place.
“At the moment we are out of Superpole and that really disappoints me. We'll see what tomorrow's sessions bring”.
While Biaggi faces a tense wait, it was a case of mission accomplished for team-mate Eugene Laverty, who set the eleventh fastest lap time.
“The important thing today was to get into the top 16 in order to secure a spot in Superpole in case it rains tomorrow,” he said. “The feeling with the bike on dry track is promising, but I was also able to get around the track on the wet without any particular problems.
“No matter what the conditions are tomorrow, I'm confident I can do well. Depending on the weather, we'll decide which set up to work on in view of the races, where our goal is still to get on the podium”.