The opening MotoGP test of 2016 is underway at Sepang in Malaysia.

Due to the change from Bridgestone to Michelin tyres and introduction of a single ECU, many factories have substantial developments to try before settling on their 2016 race machinery.

Yamaha has two different M1s available for Jorge Lorenzo and Valentino Rossi, the most obvious difference being fuel tank position, while Honda's priority is to evaluate two different engine specifications with factory stars Marc Marquez and Dani Pedrosa.

Ducati's GP16 is making its debut in the hands of Andrea Iannone and Andrea Dovizioso, alongside last year's GP15, while Suzuki have three GSX-RRs available for Maverick Vinales and Aleix Espargaro; a 2016, 2015-2016 hybrid and 2015.

Although Suzuki now has a seamless shift gearbox, only the 'stage 1' version (seamless upshift only) is at Sepang. The factory hopes to debut a 'stage 2' (seamless upshift and downshift) next time in Australia.

Aprilia will still be using its 2015 bike, with the 2016 RS-GP due to be present at a private test in Qatar later this month, instead of taking part in the next official test at Phillip Island.

The satellite teams are using various forms of 2015 machinery, although the Honda entries (LCR and Marc VDS) are set to receive 2016 updates by the start of the season.

Ioda, considering a switch to WSBK, is the only team absent from this week's test although new Marc VDS signing Jack Miller is riding injured after breaking his leg in a motocross training accident last month.

Testing takes place between 10am and 6pm. Retired double world champion Casey Stoner, who made his Ducati return on Saturday at Sepang (setting a 2m 2.1s on a dirty track), is tipped to test again tomorrow.

Sepang will be resurfaced after this test...

1.Valentino RossiITAMovistar Yamaha MotoGP (YZR-M1)2m 2.654s[Lap 10/11]2.Danilo PetrucciITAOcto Pramac Yakhnich (Desmosedici GP15)2m 2.714s +0.060s[3/6]3.Dani PedrosaESPRepsol Honda Team (RC213V)2m 2.856s +0.202s[4/5]4.Scott ReddingGBROcto Pramac Yakhnich (Desmosedici GP15)2m 2.922s +0.268s[6/7]5.Jorge LorenzoESPMovistar Yamaha MotoGP (YZR-M1)2m 3.014s +0.360s[4/5]6.Yonny HernandezCOLAvintia Racing (Desmosedici GP14.2)2m 3.083s +0.429s[10/11]7.Hector BarberaESPAvintia Racing (Desmosedici GP14.2)2m 3.136s +0.482s[5/6]8.Bradley SmithGBRMonster Yamaha Tech 3 (YZR-M1)2m 3.177s +0.523s[9/10]9.Marc MarquezESPRepsol Honda Team (RC213V)2m 3.267s +0.613s[3/4]10.Andrea DoviziosoITADucati Team (Desmosedici GP15/16)2m 3.287s +0.633s[6/6]11.Pol EspargaroESPMonster Yamaha Tech 3 (YZR-M1)2m 3.700s +1.046s[10/11]12.Aleix EspargaroESPTeam Suzuki Ecstar (GSX-RR)2m 3.720s +1.066s[10/11]13.Cal CrutchlowGBRLCR Honda (RC213V)2m 4.218s +1.564s[5/7]14.Eugene LavertyIRLAspar MotoGP Team (Desmosedici GP14.2)2m 4.472s +1.818s[7/8]15.Alvaro BautistaESPFactory Aprilia Gresini (RS-GP)2m 4.581s +1.927s[8/9]16.Tito RabatESPEstrella Galicia 0,0 Marc VDS (RC213V)*2m 4.667s +2.013s[14/15]17.Loris BazFRAAvintia Racing (Desmosedici GP14.2)2m 5.070s +2.416s[9/9]18.Maverick Vi?alesESPTeam Suzuki Ecstar (GSX-RR)2m 5.199s +2.545s[4/5]19.Stefan BradlGERFactory Aprilia Gresini (RS-GP)2m 5.377s +2.723s[3/4]20.Andrea IannoneITADucati Team (Desmosedici GP15/16)2m 7.187s +4.533s[3/5]

Blue Name = No Concessions.
7 engine changes for the season. Engines must be identical throughout season within same team (development freeze). 5 days of private testing.Black Name = Concessions.
9 engine changes. No engine development freeze. Unlimited private testing.* Rookie

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Official Sepang MotoGP records:Best lap: Dani Pedrosa SPA Honda 1m 59.053s (2015)Fastest race lap:Jorge Lorenzo SPA Yamaha 2m 0.606s (2015)

Unofficial Sepang MotoGP record:Marc Marquez SPA Honda 1m 58.867s (2015 testing)