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Alex Lowes has topped the Friday practice timesheet at a very wet Assen eventually taking top spot by half a second from Tom Sykes, as Chaz Davies sneaks into the top ten to bag a place in superpole two.
The Crescent Pata Yamaha rider spent the majority of the session chipping away at his time in the wet before his late flyer of 1m 52.701s sent him safely clear of FP1's fastest rider Sykes.
It was a positive day all round for Paul Denning's factory Yamaha squad with Sylvain Guintoli taking third overall, pointing to the R1's potential in the wet.
After the morning rain soaked the Assen track all riders stuck with the full wet Pirelli tyres during race simulation runs, with Sykes catching the eye with a string of quick laps.
In a similar fashion to Aragon the Crescent Pata Yamaha pair of Lowes and Guintoli continued to demonstrate the R1's outright single lap pace as they punched to the top of the timesheet heading into the final 10 minutes of the session.
Defending champion Jonathan Rea's progress was prematurely halted when he had to push his Kawasaki ZX-10R into the pits with a technical fault.
With results from Friday's practice deciding the top ten to progress straight into the pole position shootout, a late blast of quick laps had been expected but an untimely heavy rain shower effectively denied any late runs. The chequered flag fell with the majority of riders in the garage opting not to risk crashing on the slippery surface.
As a result Xavi Fores was the top Ducati rider in fourth ahead of Honda's Nicky Hayden and Rea. Davide Giugliano secured a place in the top ten with a quick lap late in the session to displace Lorenzo Savadori on the Aprilia to eighth.
Despite suffering two crashes, one in each session, home favourite Michael van der Mark claimed ninth with Davies ducking into the top ten by just two-tenths from MV Agusta's Leon Camier.