Ben Spies gave nothing away regarding his 2013 destination during his first press conference appearance since announcing that he will leave the Factory Yamaha MotoGP team at the end of this year.

A return to World Superbike with BMW has been the most frequently mentioned rumour, but the Texan refused to reveal his intentions on Thursday at Laguna Seca, ahead of his home US Grand Prix.

"I've known for quite a bit what my personal decision was and I thought this was the right time to do it with all the contracts happening with other riders," began Spies. "To be out of the ball game with that. That's basically it.

"There's a litany of reasons behind it - just getting back to stress-free and doing what I want to do and finish out the season strong.

"What I said [in the email] is what I mean and that's all that's going to be said about it at this point until I'm ready to talk about the future.

"It's not going to change anything. For sure, especially at Laguna and the rest of the races we're going to give 100 per cent and we want to do what we're capable of doing and what the bike's capable of doing for the team.

"Nothing changes from that standpoint. I just made a decision, something that I'd known for quite a while and that I wanted to get it off my chest and out of the way.

"Now that we've done that now I feel like the weight of the world is off my shoulders and I can do what I set out to do."

Several direct and indirect attempts to tease clues from Spies regarding his future plans proved unsuccessful and the Texan wouldn't even rule out halting racing or returning to America.

"I don't know yet. Whenever I do know I'll let you all know."

Spies, just tenth in the championship at the midway point of the season, will be seeking his first podium of the season and first ever at the US GP this weekend.

"Laguna has always been a good track for me [in AMA]. In GP I've struggled quite a bit, but I like the track," he said. "I think everyone loves it. It has so much elevation changes and if your bike is working good it's one of the best tracks to ride on."