The following list shows the number of engines in use (or 'opened') by each MotoGP rider as of warm-up in Argentina, round 3 of 18.

'Withdrawn' means that an engine cannot be used again.

The Factory class Honda and Yamaha riders are restricted to five engines for the season, while the others have a maximum of 12 engines available.

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Factory class:
Marco Melandri (Aprilia): 5 engines [1 withdrawn]

Andrea Iannone*** (Ducati): 3 engines
Marc Marquez* (Honda): 3 engines
Alvaro Bautista (Aprilia): 3 engines

Valentino Rossi (Yamaha): 2 engines
Jorge Lorenzo (Yamaha): 2 engines
Bradley Smith (Yamaha): 2 engines
Pol Espargaro (Yamaha): 2 engines
Andrea Dovizioso (Ducati): 2 engines
Danilo Petrucci (Ducati): 2 engines
Yonny Hernandez** (Ducati): 2 engines
Dani Pedrosa (Honda): 2 engines
Cal Crutchlow (Honda): 2 engines
Scott Redding (Honda): 2 engines
Aleix Espargaro (Suzuki): 2 engines
Maverick Vinales (Suzuki): 2 engines
Alex de Angelis (Aprilia): 2 engines

* Marquez suffered an engine problem during qualifying in Texas, requiring a third engine to be opened. However none of Marquez's engines have been withdrawn, meaning the Texas engine could return to use after being checked.

** Hernandez's bike caught fire during the race in Argentina, after this engine list was issued.

*** Iannone suffered an engine issue during practice in Argentina but, as with Marquez, while a third engine was opened no engines have yet been withdrawn.

Open class:
Stefan Bradl (Yamaha Forward): 3 engines [1 withdrawn]
Karel Abraham (Honda): 3 engines
Jack Miller (Honda): 3 engines

Loris Baz (Yamaha Forward): 2 engines
Hector Barbera (Ducati): 2 engines
Mike di Meglio (Ducati): 2 engines
Eugene Laverty (Honda): 2 engines
Nicky Hayden (Honda): 2 engines