Yamaha is now amid a 23-race winless streak in MotoGP, and the Iwata-based manufacturer has failed to even score a podium finish in the past four race weekends.
“There is no solution because if you try to go fast into the corner you slide,” said Zarco. “If you try to slow down to have better acceleration, the bike doesn’t have acceleration so then I don’t know where can I go.
“We know that with the team, since now a long time and we know that we have to play with it, to ride with it.
“The problem is when you are in that position I am now, it is sad because you give all what you have to give and then you even wonder if you are okay or not as a rider.”
Zarco had his worst race result of the year so far at Aragon, where he finished 14th. The Frenchman said he “can’t enjoy” riding his two-year-old Yamaha bike as he wasn’t even able to be part of a group fighting for 10th.