Swan Yamaha moved to the top of the timesheets during the second British Superbike free practice session of the weekend at Oulton Park, Tommy Hill leading Michael Laverty.
Brands Hatch winner Hill lapped more than a second faster than morning pace setter Josh Brookes to emerge a similarly impressive seven tenths quicker than Laverty on the sister Yamaha YZF-R1.
Brookes moved up in the latter stages to go third fastest, ahead of Loris Baz, Stuart Easton and Gary Mason, the MSS Colchester Kawasaki pair enjoying a strong start to their Oulton Park weekend.
Jon Kirkham was seventh fastest ahead of the two HM Plant Hondas, Ryuichi Kiyonari – who suffered a mechanical issue late on – marginally quicker than Shane Byrne. Peter Hickman rounded out the top ten on the best of the Tyco Hondas.
Further back, John Hopkins was 13th fastest on the Samsung Crescent Suzuki, just ahead of the best Ducati rider, Michael Rutter. WFR Honda's Alex Lowes led the EVO riders in 15th position overall.
The session was stopped for a short time following separate accidents for Simon Andrews and Tommy Bridewell, while Jenny Tinmouth also completed just a handful of laps before coming off her Splitlath Aprilia.