Testing began at 10am and concludes at 6pm, but rain fell from 12-3:30pm.
Hector Barbera was the first rider to try some wet laps, until he fell from his Pramac Ducati at 1:15pm. Yamaha's Ben Spies plus Avintia team-mates Ivan Silva and Yonny Hernandez then went out for a short session with wet weather tyres shortly after 3pm. Jorge Lorenzo did likewise half-an-hour later.
The sun is now shining but the track is far from dry.
Repsol Honda riders Casey Stoner and Dani Pedrosa - first and second on day one - plus fellow RC213V riders Alvaro Bautista (Gresini) and Stefan Bradl (LCR) have not been on track today.
HRC has now confirmed that they were checking the cause of Pedrosa's day one engine problem, but will be back for day three (CLICK HERE
Karel Abraham (Cardion AB Ducati) withdrew from the test on day one due to pain from shoulder and back injuries sustained at Jerez last week.
The second Sepang test finishes on Thursday evening, after which only one more official test (at Jerez) will remain before the start of the racing season.CLICK HERE
for pictures from the test.
1. Ben Spies
USA Yamaha Factory Racing 2m 1.285s
2. Jorge Lorenzo
ESP Yamaha Factory Racing 2m 1.293s
3. Andrea Dovizioso
ITA Monster Yamaha Tech 3 2m 1.522s
4. Cal Crutchlow
GBR Monster Yamaha Tech 3 2m 1.695s
5. Nicky Hayden
USA Ducati Team 2m 1.748s
6. Hector Barbera
ESP Pramac Racing 2m 1.989s
7. Valentino Rossi
ITA Ducati Team 2m 2.130s
8. Franco Battaini
ITA Ducati Test Rider 2m 3.566s
9. Colin Edwards
USA Forward Racing (Suter-BMW CRT) 2m 5.816s
10. Ivan Silva
ESP Avintia (FTR-Kawasaki CRT) 2m 7.813s
11. Yonny Hernández
COL Avintia (FTR-Kawasaki CRT) 2m 8.213s
(10/16)Fastest day one time:Casey Stoner
AUS Honda 2m 1.761sFastest Sepang I test times (Feb 2):By manufacturer:Casey Stoner
AUS Honda 1m 59.607sJorge Lorenzo
ESP Yamaha 2m 0.198sValentino Rossi
ITA Ducati 2m 0.824sColin Edwards
USA Suter 2m 4.722sIvan Silva
ESP FTR 2m 8.225sOfficial Sepang MotoGP lap records:Pole position: Valentino Rossi
ITA Yamaha 2m 0.518s
(2009)Fastest race lap:Casey Stoner
AUS Ducati 2m 2.108s