Alvaro Bautista says he is satisfied with his first impressions of Aprilia's V4 pneumatic valve engine following his maiden test with the powerplant in Jerez, but admits there is still 'work to do' to harness its potential.

Having enjoyed his first laps on the factory Aprilia in Valencia earlier in the month, Bautista returned to action in Jerez for three further days on the bike, headlined by the opportunity to sample the manufacturers' pneumatic valve V4 engine.

Though the focus on electronics on day one and poor weather on day three meant Bautista only got one fully dry day to try the engine, he was positive in his feedback, even if he admits it is clear there is still work to be done.

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"We can be satisfied with the way things went, even if the foul weather slowed down our work," he said. "During the first day I continued using the bike in the same configuration as the recent tests in Valencia. We concentrated on the chassis set up, finding a few solutions that I liked and the allowed us to get to know the bike fully.

"On the second day I was able to use the new pneumatic valve engine. It has a lot of power but there is still a lot of work to do in terms of distributing it.

"On day three we took a few laps in the wet which were useful in any case to assess the characteristics of the new engine in these conditions. Now we will start the winter break. I'll take a bit of a rest to recover from this long season, after which I'll get back to training so that I'm ready for the tests in February.

"In the meantime I will definitely be paying a visit to Aprilia to see the hard work the engineers are doing on the bike up close and in person."

Bautista managed a best lap of 1min 40.6secs during the test. For reference, Andrea Dovizioso was the fastest rider on track over the course of the test with a 1min 38.9secs.