Leon Haslam says he is becoming increasingly confident on the Aprilia RSV4 after producing more encouraging lap times during pre-season World Superbike testing in Portimao.

The 2010 WSBK runner-up, who made the switch to the factory-affiliated Red Devils Roma Aprilia team over the winter, caught the eye with some quick times during testing at the end of 2014, form he continued to show as pre-season sessions got underway.

Indeed, though inclement weather conditions played their part in limiting track time, Haslam still posted a best time of 1min 43.5secs, placing him on a par with what he managed at the circuit on a PATA Honda in Superpole during the warmer 2014 race weekend.

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With the countdown to the 2015 World Superbike opening continuing, Haslam says he is impressed with the progress being made.

"The weather definitely wasn't kind to us for these tests but I'm quite pleased anyway. In the afternoon we were fast and I can tell that my feeling with the RSV4 is increasing lap by lap.

"There is still a lot of work to be done and I can't wait to get back on the track in Jerez to continue our progress and make sure we're in good form for the beginning of the season."