Cal Crutchlow continued his strong weekend form at Brno by topping the timesheets in Monday's official test at the Czech circuit.
Despite favourable conditions times were slightly slower than the weekend, with riders and teams instead focusing on various development and set-up work.
With around three hours to run Crutchlow, who claimed his first MotoGP podium on Sunday, moved up into top spot with a 1m56.461s that was never headed.
His Tech 3 Yamaha team-mate Andrea Dovizioso backed him up in second, just over 0.1s down the road, while behind them Yamaha's Jorge Lorenzo and Honda's Dani Pedrosa once again proved almost inseparable in third and fourth.
Lorenzo, who tested both this year's bike and a new M1 prototype frame fitted with his current engine, wound up third fastest.
He ended just four hundredths of a second clear of Pedrosa, whose work was based around testing new parts. Honda plans to test further parts at Aragon next week.
On the other side of the Honda garage, Jonathan Rea got his first taste of 1000cc MotoGP machinery as he prepares to stand in for the injured Casey Stoner at Misano and Aragon.
The World Superbike racer reported that adjusting to Bridgestone rubber was the hardest part of the day, but nevertheless improved consistently and eventually ended the day eighth fastest.
The two works Hondas were separated by the satellite counterparts of Stefan Bradl and Alvaro Bautista, and the second Yamaha of Ben Spies.