MotoGP rookie Maverick Vinales was left flummoxed by the rear-end problem he faced with his Suzuki GSX-RR at Aragon on Friday.

Vinales finished in a lowly 16th place after lapping in 1m 49.680s as he ended the day 2.1 seconds off the fastest lap set by Movistar Yamaha's Jorge Lorenzo.

The Spanish rider was at a loss to explain the issues he faced on day one, admitting he had 'no clue' over the cause of the lack of rear-end grip at the Spanish circuit.

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"I have a strange feeling about today because my performance isn't as good as it normally is and I have no clue yet on what could be wrong," said Vinales.

"We did test here so we have some reference and the machine is pretty-much the same we are used to, as well as the approach we took with the work, but I cannot feel confident with the machine.

"I have a lot of sliding from the rear of the bike and it looks like the GSX-RR has changed its behaviour even if we didn't make major changes," he added.

"For sure the machine and my own potential is much higher, we only need to keep calm, revise the data of these two early sessions and find a direction to find back our usual good performance."