MotoGP rookie Eugene Laverty said the surge in temperature at the Circuit of the Americas on Sunday completely altered his feeling with the Aspar Honda.

Laverty also struggled with tyre fade in the latter part of the race as he finished in 16th position, one place outside the points in Austin.

The Northern Ireland rider, who had been as high as 12th place on the opening laps, said: "It was strange today because the bike felt different to the rest of the weekend with the change in temperature. Also the tyres really dropped off at the end of the race.

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"With my riding style it was hard to maintain full lean angle and I was more sat up on the bike, like on a Superbike, and that made me lose touch with the guys I was lapping with.

"I got left behind a little and even though I tried to get back with them it was too late," Laverty added.

"This is a physical circuit and once the tyres went it was even harder. Anyway, it was an interesting race, I made a good start and I felt good in the early laps.

"I was able to be aggressive and I had a good fight there for a while with Jack Miller."