Colin Edwards will hang up his MotoGP race leathers at the end of this season without having reached the finish of his home round in Austin, Texas.

For the second year running Edwards was forced out of the event in his home state by a technical problem in the race.

"That's two years in a row I've come here and not finished a race," said the Forward Racing rider. "We were struggling all weekend. My last few laps with the right side of the front tyre, I could barely turn the thing.

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"Then I was going down the back straight, sixth gear wide open, I felt a kind of surging lie it was losing fuel pressure and as soon as I went to downshift and brake it just quit. I tried to bump start, but nothing."

Fans' favourite Edwards announced that he is calling time on his MotoGP career on Thursday.

"All the emotional stuff was on Thursday. On the grid it was just down to business and let's go racing," he said.

Edwards will get a further chance to race on American asphalt during the Indianapolis round in August.

Edwards' Forward Yamaha team-mate Aleix Espargaro also struggled in the COTA race, but was able to cross the line in ninth.