Following Sunday's season-ending Valencia Grand Prix, a two-day post season MotoGP test began at the circuit on Tuesday.

However rain began falling shortly after the track opened and the circuit has remained wet ever since. The fastest lap times were set on slicks just before the rain.

The test marks Valentino Rossi's first Yamaha laps since 2010, while Rossi's Ducati replacement Andrea Dovizioso is making his Desmosedici debut.

Rossi (pictured) - did not complete a flying dry lap.

By contrast, Moto2 stars Marc Marquez (Honda), Andrea Iannone (Ducati) and Bradley Smith (Tech 3 Yamaha) are yet to make their first official MotoGP appearances - Iannone has previously tested for Ducati.

Former MotoGP racer Loris Capirossi rode Smith's bike this morning, posting a lap of 1m 35.954s, which has since been dropped from the timesheets.

Ben Spies, moving from Yamaha to Ducati for 2013, is not present due to recent surgery. His place is being taken by new Ducati test rider Michele Pirro.

Testing concludes at 5pm local time and is due to continue on Wednesday, although Yamaha may switch to Aragon for day two.

CLICK HERE for extensive picture coverage from the Valencia MotoGP test...

1. Alvaro Bautista ESP Honda Gresini (RC213V) 1m 35.936s (Lap 4/5)
2. Stefan Bradl GER LCR Honda MotoGP (RC213V) 1m 36.198s (3/5)
3. Andrea Dovizioso ITA Ducati Team (GP12) 1m 39.868s (3/30)
4. Hiroshi Aoyama JPN Avintia (FTR-Kawasaki CRT) 1m 42.239s (2/21)
5. Nicky Hayden USA Ducati Team (GP12) 1m 42.571s (21/24)
6. Valentino Rossi ITA Yamaha Factory (YZR-M1) 1m 43.736s (27/28)
7. Michele Pirro ITA Pramac Racing (GP12) 1m 44.838s (25/26)
8. Randy De Puniet FRA Aspar (ART CRT) 1m 46.045s (16/19)
9. Aleix Espargaro ESP Aspar (ART CRT) 1m 46.060s (10/15)
10. Colin Edwards USA Forward (FTR-Kawasaki CRT) 1m 46.426s (14/15)
11. Karel Abraham CZE Cardion AB Motoracing (ART CRT) 1m 46.992s (21/22)
12. Claudio Corti ITA Forward (FTR-Kawasaki CRT) 1m 48.020s (15/18)
13. Andrea Iannone ITA Pramac Racing (GP12) 1m 51.209s (14/14)
14. Hector Barbera ESP Avintia (FTR-Kawasaki CRT) 1m 51.857s (21/22)

Danilo Petrucci ITA Came IodaRacing (Suter-BMW CRT) No Time
Dani Pedrosa ESP Repsol Honda (RC213V) No Time
Cal Crutchlow GBR Yamaha Tech 3 (YZR-M1) No Time
Shane Byrne GBR Paul Bird Motorsport (ART CRT) No Time
Marc Marquez ESP Repsol Honda (RC213V) No Time
Jorge Lorenzo ESP Yamaha Factory (YZR-M1) No Time Bradley Smith GBR Yamaha Tech 3 (YZR-M1) No Time

Official Valencia MotoGP records: Best lap: Dani Pedrosa ESP Honda 1m 30.844s (2012) Fastest race lap: Casey Stoner AUS Ducati 1m 32.582s (2008)