Vinales remains close
So what of Yamaha? Vinales did a slightly increased 52 laps on Day 2 and was almost top, but he did say they needed to make more progress and improve on the final day.
Despite having low grip due to track conditions, the Spaniard impressed by setting a fastest lap of 1'54.650s on lap 33 for a temporary first place.
Different for Rossi
It was a different story - in terms of laptime at least - for team-mate Valentino Rossi.
The 'Doctor' ended the day down in P19 and over a second off Vinales after 51 laps, but the number 46 has never been one to blast out the blocks in testing.
Team Director Massimo Meregalli says it's been time to confirm positives from Sepang, and that the speed and consistency from Day 1 were encouraging.
Marquez fastest
At Honda, Marc Marquez (Repsol Honda Team) was the fastest man for the marque, in fifth.
A 1:55.004 was his best effort, but crucially the reigning champion managed nearly 60 laps - a good sign in his ongoing recovery from shoulder surgery, with Marquez having done less than forty on most test days so far.
Espargaro impresses
Aleix Espargaro (Aprilia Racing Team Gresini) impressed once again on Day 2. He ended the day in sixth and put in 55 laps.
Aprilia had a new exhaust, and Technical Manager Romano Albesiano said Espargaro and team-mate Andrea Iannone were testing race setup and aero.