MotoGP World Championship leader Marc Marquez is working to improve the acceleration of his Repsol Honda at Le Mans, where he is losing time on the RC213V.

Marquez was third fastest in the morning and afternoon free practice sessions at the French track on Friday, setting his best time in 1m 33.313s as he finished four tenths adrift of pacesetter Jorge Lorenzo.

The 23-year-old, though, remains cautiously optimistic after day one.

"Today was demanding. We knew this circuit would cause us to struggle a bit, but we're overcoming things fairly well," said Marquez.

"I have a good pace and I'm feeling good, although we're losing some time on both of this circuit's hard acceleration points; it's something that's difficult to recover from afterwards.

"We're working on this aspect and we'll see if we can take another step forward tomorrow, both with the electronics and with the set-up of the bike," he added.

"It will also be important to make a good decision about which tyres we'll use on Sunday, although it seems that both of the compounds we have available are pretty good."