By Stephen English

Casey Stoner, who will retire from MotoGP after Sunday's Valencia seaso🌼n finale, continues to feel the effects of his hefty Indianapolis crash with the Australian admitting that he still lacks flexibility in his ankle.

His home dominance at Phillip Island notwithstanding, it was clear after t🎀he opening day of practice that the very different demands of Valencia are presenting Stoner with a challenge this weekend.

Phillip Island is filled with 🎃high-speed left hand corners, whereas Valencia has a host of low-speed right hand turns that place a premium on a rider's ability to shift his weight and anchor the bike.

For Stoner thi🐽s has presented a huge challenge, with the double champion admitting as much after the end of opening practiꦿce:

"The foot feels average at the moment and in the wet conditions it wasn't good today," said Stoner, who missed three events after u🤪ndergo🐻ing ankle surgery.

"I still can't ge♕t the flexibility r🔥equired in the right corners.

"At Philip Island there's only two corners that we neeཧd to get over the right hand side of the bike.

"Here there's a few points that I co💟uldn't get off the inside enough so it was a bit difficult but I didn't push hard this morning."

Stoner was tenth in wet morning practice and then didn't record꧙ a lap time in the drying afternoon session.