Honda Racing have apologised to Casey Stoner for a throttle malfunction which left the former MotoGP world champion with a broken shoulder blade and tibia.
In his first competitive race since retiring in 2012, Stoner, 29, crashed at the Suzuka 8 Hour endurance race.
The Australian blamed a stuck throttle for the high speed crash and a valve problem was later discovered.
"HRC would like to apologise to Casey and thank him for the effort he made in attending the race," said Honda Racing.
"This kind of problem hasn't arisen before.
"However, Honda Racing Corporation will cease using this throttle specification and will design a new one to be used for endurance races."
Stoner, who won the MotoGP world titles in 2007 and 2011, said after the accident: "Well my #Suzuka8H ended spectacularly! Stuck Throttle = Broken Scapula + Fractured Tibia and a few more tweaks. Sucks!"