Ben Spies, who announced via the internet that he was leaving Yamaha on the eve of last month's US MotoGP, has rev🀅ealed behind-the-scenes tension with a senior member of the company.

After being forced out of second place by a massive engine failure in Sunday's Indianap🔯olis Grand Prix - the latest in a relentless run of race day mishaps and bad luck - Spieꦫs was asked about his level of frustration.

Whilst reflecting on the setbacks he has suffered in 2012, Spies claimed that he was told 'not to show up' for the US GP if he wasn't going to ride at a hundred p🎃ercent.

"There's frustration, but it's kind of almost got to a laughing point for me," Spies began. "I'm really not even upset about it. It's just been so many things, one after another. You don't know how to respond tꦿo it.

"At Mugello, we had food poisoning, and that was a bad experience. I tried everything I could to do what we could,🔯 but it was a bad result.

"I was told by somebody at Yamaha that if I'm not going to ride a hundred percent at Laguna [Se🧸ca], don't show up.

"I came to Laguna, and I tried the best I could. The bik🅠e had a malfunction. Then we came here with a hund🔜red percent and did the best we could, and we had another mechanical with the bike. I've given my hundred percent.

"So to be told what I was told aft𝔍er Mugello and the way it was, and then to give the effort I've giveไn the last two weekends, I just don't think it's been too fair."

Spies, who was racing with a shoulder injury afte🎃r falling in qualifying, refused to identify the pe💛rson who had made the comment: "I'm not going to say any names, but yeah, it was somebody high up."

When asked if he felt Yamah🦩a was not giving him a hundred percent, S🐭pies added:

"No, I wouldn't say that. I know my team is, my crew. I🏅t's shown. The bike's been good the last two weekends. I just don't respect what was to🌜ld to me and what we've tried to do this year.

"We had our pro🐈blem at Assen with the tyre, which was not Yamaha's fault, and a𓆉lso at Silverstone. But at Qatar and here and Laguna, we've had three mechanical problems with the bike. I wouldn't say it's Yamaha's fault at all. It's just been bad luck, too.

"Why it's happening to me, I don't know. There was a big frustration level, I'd say, aꦡbout a month ago. But now it's just... we go to Brno, and I just kind of wonder what's going to happen next."

Spies, who is just tent🍒h in the championship with a best finish of fourth this year, will be replaced by Valentino Rossi next season. The former World Superbike champion, with Yamaha, is yet to announce his 2013 pla🍌ns.

Team-mate Jorge Lorenzo le𒐪ads the championship and finished second at Indianapolis after Spies' smokey exit.