Maverick Viñales and Valentino Rossi seem to have found some good settings on day two of the Sepang test. 
Begin Press Release:

MOVISTAR YAMAHA TEAMMATES TOP SECOND SEPANG TEST DAY
Movistar Yamaha MotoGP’s Maverick Viñales and Valentino Rossi were back on track today at the Sepang International Circuit in Malaysia for the first 2018 pre-season Official IRTA test. The riders continued with their testing schedules, but saved some energy for the final stages of the session to post hot laps. They ended day two securing first and second place respectively in both today’s and the combined timesheets.

Sepang (Malaysia), 29th January 2018 РThe Movistar Yamaha MotoGP Team were back on track today to continue work at the first official IRTA test of the 2018 season, held at the Sepang International Circuit. Maverick Vi̱ales and Valentino Rossi again worked diligently to improve their 2018 YZR-M1s, and the results echoed the positive rider feedback. They finished the second day in first and second place respectively. Similar to yesterday morning, the MotoGP riders waited for the track to dry before they ventured out just before 12 o?clock local track time.
Viñales had a busy schedule again. His strategy remained the same as for Day 1: put in a lot of laps to work on tyre wear. He initially headed out on the same bike as yesterday to get a feel for the conditions, before he gave the new fairing a try. Throughout the second day of testing the Spaniard noticed im...