Honda have pinpointed a dropped valve as the cause of Nicky Hayden's retirement from the Australian MotoGP.
The American was having his best race of the season, pushing eventual winner Casey Stoner for the lead until his Repsol Honda suddenly went onto three cylinders halfway around lap 13.
On Friday Hayden had told autosport.com that the 2007 Honda has had problems with running hot and that a major re-think is in the pipeline for next year.
He was unsure if his Phillip Island failure was related to the same issue, and compared the problem to the difficulties the team had experienced during the very hot race day at the Sachsenring.
"In Germany she slowed down a lot and I still finished, but here I just kept going," Hayden said.
"She went on three cylinders until she let go.
"I looked once but it didn't look like it was running hot."
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