Pol Espargaro becomes the 5th rider on track so far today.
12:30pm and Takaaki Nakagami is fastest for HRC with the first 1m 59s lap of the day.
Pirro, Miller and Dani Pedrosa are the others to have set a lap time.
We have the first non-Ducati on track, new Pramac Yamaha rider Jack Miller completing his first run of the year on an M1.
Meanwhile, Pirro's best is down to a 2m 1.031s, so that's his best time of the test so far.
The quickest lap on Friday was a 1m 59.691s by Pol Espargaro (KTM).
Three KTMs are being warmed up, including a test bike with an all-black rear section.
Pirro's best time is down to a 2m 1.828s, which is within half-a-second of his best time on day 1, indicating the track conditions are decent now.
Pirro is back on track, this time on a different (all black) Ducati.
Michele Pirro has now become the first rider to officially complete a flying lap today, but at 2m 6.514s it's a long way off pure dry pace.
Pirro only did a slow installation lap before returning straight to the pits, where Fabio Quartararo and Yamaha walked over to have a look at the GP25...
11:12am and we have the first rider out on track today: Ducati test rider Michele Pirro.
A few bikes have been heard warming up but the mixed conditions - too dry for wets, too wet for slicks - mean the pitlane is silent as we approach the end of the opening hour on Saturday.
The damp start to day two means that we're still waiting for the first bike out on track.
Unfortunately, the cloudy overcast conditions means the track could be slow to dry.