Sylvain Guintoli has vowed to come back stronger at Sepang after dramatically crashing out of the second World Superbike race at Laguna Seca when he was caught out by the pitting Alex Lowes.

The defending champion finished a lonely seventh in race one on the PATA Honda, but was hoping for better in race two after making adjustments to the CBR1000RR in the break between.

However, his race would end abruptly when he ran out wide on the exit of the penultimate corner with a view to passing Lowes on the inside of the tight left-hand final bend. Unbeknown to Guintoli though, Lowes was peeling into the pit lane due to tyre problems, the Suzuki rider coming across the Honda's front wheel and sending the Frenchman to the tarmac.

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Frustrated that Lowes didn't signal he was heading for the pit lane, Guintoli was frustrated to lose ground in the fight for the overall top five.

"I had a really good start to race one but I wasn't able to keep the pace after the first few laps. I felt I was losing out on corner exit and having to try really hard to make it up on the brakes, which was difficult.

"In race two, the start was OK but on lap two I was lining up to pass into the last corner when [Alex] Lowes entered the pit lane without any signal and I crashed. It was a really, really upsetting way to finish the weekend, but we'll just have to come back fighting in Sepang in two weeks."