Britain's Scott Redding has opted to use an older- specification of engine in his Aprilia at the Argentine MotoGP round after losing all feeling with the one introduced in Qatar.

Redding battled to 13th on the Friday combined timesheets despite suffering with a back problem and says he is now happy with the machinery but Aprilia are going to investigate why one feels entirely different to the other.

“We’re using the bike two from Qatar, we tested the bike one halfway through the second session and it was the same feeling as Qatar. So one positive is that I have the feeling back with the bike and I am happy with that," said Redding.

“They checked everything again so maybe we need to build a new bike and see because if they don’t see anything then it should be the same. I am quite happy because I have got my feeling back that I had at the testing and I can feel what I am doing on the bike. I am where I feel I should be and doing so I’m really happy with that.”

“This morning I was riding in the first session and couldn’t even get off the bike, I was almost crying in the helmet,” he said. “In the end I had to take the injection to reduce the pain and that helped me quite a lot on the bike.

“I’m generally quite happy and I feel a little bit relieved as pressure is off my shoulders as I don’t feel I am losing my mind.”