Pata Honda's Jonathan Rea was unable to fathom why he struggled with the CBR1000RR Fireblade during the final World Superbike test of 2013 at Jerez.

Rea had been buoyed by a positive shakedown previously at Aragon, but the Northern Ireland rider could not build on that progress at Jerez.

The 26-year-old was credited with the fifth fastest time unofficially in 1m 41.8s behind Alex Lowes on the Voltcom Crescent Suzuki.

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"After a positive test at Aragon, I really struggled here at Jerez. It's hard to put a finger on our problems but I feel that the character of our engine is quite aggressive and that makes the lap difficult here," said Rea.

"We have a few new strategies to implement at our next test in January, which should help. I completed over 200 laps here so now I'm really looking forward to the winter break.

"I hope to come back in January to make some more progress with the CBR. Happy holidays, folks!"

Rea's season was blighted by injury following a big crash at the Nurburgring in Germany, which left him with a broken femur.

He missed the final part of the season and finished the championship in ninth position overall, taking one victory on home soil at Silverstone.