Following Sunday's season-ending Valencia Grand Prix, a two-day 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.
It then rained at both Valencia and Aragon on Wednesday morning - but conditions at Valencia finally improved enough for slick tyres from mid-afternoon.
That convinced 2012 title runner-up Dani Pedrosa to head out for the first time since winning Sunday's race - and Pedrosa was on top of the timesheets by 3:30pm, when new Repsol Honda team-mate Marc Marquez finally made his MotoGP debut.
The Moto2 champion got to within 2.1s of Pedrosa at the end of his first run and Marquez eventually finished the test 1.081s behind Pedrosa, whose best time was below the official race lap record.
Marquez's fellow MotoGP rookie Bradley Smith had made his debut, on wet tyres, shortly after midday.
Smith then went back out on slicks and finished the test +2.2s from Pedrosa, with Yamaha Tech 3 team-mate Cal Crutchlow - among those to sit out the wet weather - moving into second place in the dry.
Ben Spies, switching from Yamaha to Ducati for 2013, was not present due to recent surgery. His place was taken by new Ducati test rider Michele Pirro.
for extensive picture coverage from the Valencia MotoGP test...
1. Dani Pedrosa
ESP Repsol Honda (RC213V) 1m 32.322s
2. Cal Crutchlow
GBR Yamaha Tech 3 (YZR-M1) 1m 32.671s
3. Stefan Bradl
GER LCR Honda MotoGP (RC213V) 1m 32.813s
4. Nicky Hayden
USA Ducati Team (GP12) 1m 32.956s
5. Alvaro Bautista
ESP Honda Gresini (RC213V) 1m 33.109s
6. Andrea Dovizioso
ITA Ducati Team (GP12) 1m 33.238s
7. Marc Marquez
ESP Repsol Honda (RC213V) 1m 33.403s
8. Michele Pirro
ITA Pramac Racing (GP12) 1m 33.625s
9. Andrea Iannone
ITA Pramac Racing (GP12) 1m 33.833s
10. Randy De Puniet
FRA Aspar (ART CRT) 1m 34.081s
11. Bradley Smith
GBR Yamaha Tech 3 (YZR-M1) 1m 34.538s
12. Karel Abraham
CZE Cardion AB (ART CRT) 1m 35.309s
13. Danilo Petrucci
ITA IodaRacing (Suter-BMW CRT) 1m 35.403s
14. Hector Barbera
ESP Avintia (FTR-Kawasaki CRT) 1m 39.248s
15. Aleix Espargaro
ESP Aspar (ART CRT) 1m 43.517s
USA Forward (FTR-Kawasaki CRT) No Time
JPN Avintia (FTR-Kawasaki CRT) No Time
GBR Paul Bird Motorsport (ART CRT) No Time
ITA Forward (FTR-Kawasaki CRT) No Time
ESP Yamaha Factory (YZR-M1) Not present
ITA Yamaha Factory (YZR-M1) Not present
Fastest Day 1 time:
ESP Honda 1m 35.936s
Official Valencia MotoGP records:
ESP Honda 1m 30.844s
Fastest race lap:
AUS Ducati 1m 32.582s