Following Sunday's season-ending Valencia Grand Prix, a two-day post season MotoGP test began at the circuit on Tuesday.
Day one was marred by poor weather, which caused seven of the 21 riders to remain in the pits and prompted the Factory Yamaha team to send Valentino Rossi and Jorge Lorenzo to Aragon for day two.
Unfortunately, rain has been falling off and on at both Valencia and Aragon on Wednesday.
Rossi, who rode 28 wet laps during his Yamaha return on Tuesday, and reigning champion Lorenzo have both reportedly been on track at Aragon - where some World Superbike teams are also testing. Lorenzo fell without harm on the wet track.
Moto2 stars and 2013 MotoGP rookies Marc Marquez and Bradley Smith did not set a lap time on Tuesday at Valencia. Smith then left the pits for his first MotoGP laps with Tech 3 Yamaha, on wet tyres, shortly after midday on Wednesday.
The 21-year-old Englishman has so far lowered his best time to within 3.2s of new Ducati test rider Michele Pirro.
As well as Marquez and Smith, Dani Pedrosa, Cal Crutchlow, Shane Byrne, Danilo Petrucci and Lorenzo sat out day one of testing. Ben Spies, moving from Yamaha to Ducati for 2013, is not present due to recent surgery. His place is being taken by Pirro.
Alvaro Bautista's Tuesday time was set on slicks, just before rain arrived.CLICK HERE
for extensive picture coverage from the Valencia MotoGP test...
1. Michele Pirro
ITA Pramac Racing (GP12) 1m 43.287s
2. Aleix Espargaro
ESP Aspar (ART CRT) 1m 43.517s
3. Andrea Iannone
ITA Pramac Racing (GP12) 1m 44.452s
4. Bradley Smith
GBR Yamaha Tech 3 (YZR-M1) 1m 46.566s
5. Hector Barbera
ESP Avintia (FTR-Kawasaki CRT) 1m 47.386s
(9/12) Andrea Dovizioso
ITA Ducati Team (GP12) No Time Colin Edwards
USA Forward (FTR-Kawasaki CRT) No Time Stefan Bradl
GER LCR Honda MotoGP (RC213V) No Time Hiroshi Aoyama
JPN Avintia (FTR-Kawasaki CRT) No Time Danilo Petrucci
ITA Came IodaRacing (Suter-BMW CRT) No Time Randy De Puniet
FRA Aspar (ART CRT) No Time Karel Abraham
CZE Cardion AB (ART CRT) No Time Alvaro Bautista
ESP Honda Gresini (RC213V) 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 Nicky Hayden
USA Ducati Team (GP12) No Time Claudio Corti
ITA Forward (FTR-Kawasaki CRT) No Time Marc Marquez
ESP Repsol Honda (RC213V) No Time Jorge Lorenzo
ESP Yamaha Factory (YZR-M1) Not present Valentino Rossi
ITA Yamaha Factory (YZR-M1) Not present Fastest Day 1 time:Alvaro Bautista
ESP Honda 1m 35.936sOfficial Valencia MotoGP records:Best lap: Dani Pedrosa
ESP Honda 1m 30.844s
(2012)Fastest race lap:Casey Stoner
AUS Ducati 1m 32.582s