Jerez winner Jorge Lorenzo joined his MotoGP rivals in returning to the Spanish circuit on Sunday for a day of testing, where he worked mainly to improve his race starts and early race pace.
The Fiat Yamaha rider made a thrilling recovery from fifth to first in Sunday's race, but he and his team aims to make things easier in the future.
"We worked largely on trying to understand why Jorge is so much faster later in the race and also we worked on starts, because we need to improve them too,” said team manager Wilco Zeelenberg.
“We found out some interesting information, which will help us to understand how to have the same speed throughout the race. We need to go to another track now to get a better idea of the situation, but hopefully the work we've done today will be very useful."
Lorenzo finished the test with the third fastest lap time, just 0.081sec behind Honda's Dani Pedrosa and 0.026sec from team-mate Valentino Rossi.
"It was an interesting day. Most of all we worked on our starts; I think I did something like 25 starts!” he revealed. “I do find it quite difficult because the clutch and acceleration aren't always the best parts of our package, but today was good to understand how we can improve.
"We also tried some new electronics, including traction control, and chassis parts, as well as trying a slightly different engine. The difference wasn't big but I did notice it, so I think this is the right way.
“Tomorrow [Tuesday] is my birthday and I am looking forward to finally celebrating my win!"