UPDATE 2:Nicky Hayden finished the day with a best lap time of 1m 32.576s, good enough for 13th out of the 20 riders. Hayden, who beat his best race lap time on the Ducati, was 2.040s behind Honda's Marc Marquez but quickest of the 'Open' class riders.

UPDATE 1: By 3pm Nicky Hayden had improved to a 1m 32.582s, moving him to eleventh on the timesheets, a fraction behind former Ducati team-mate Andrea Dovizioso.

Nicky Hayden rode his first Honda MotoGP laps since 2008 during testing at Valencia on Tuesday.

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Hayden raced for the factory Honda team from his 2003 grand prix debut until joining Ducati for 2009 - taking 23 podiums, three race wins and the final 990cc title.

The American, ninth in this year's standings, is returning to Honda on the new privateer 'Open' class RCV1000R run by the Aspar team.

As of 2pm, with three hours of Tuesday testing remaining, Hayden had completed 36 laps, the best of which was 2.344s behind Repsol Honda's newly crowned world champion Marc Marquez, placing Hayden 15th out of the 20 riders.

Hayden's 1m 33.023s lap time matches new team-mate Hiroshi Aoyama's Monday best. Hayden's fastest Ducati lap in Sunday's grand prix was a 1m 32.764s.

The Honda 'Production Racer' is based on the title-winning RC213V, but without the seamless shift gearbox and pneumatic valves. Like all non-factory entries it must also use the full standard ECU package, but has four litres of extra race fuel available and the option of twelve instead of five engines changes during the year.

After five tough years at Ducati, which yielded just three podiums, Hayden has 'Reset & Push Harder' written on his helmet and fuel tank for this week's test.

Aspar won both seasons of the former 'CRT' privateer class with Aleix Espargaro and Aprilia machinery.

See below for more pictures...