Jordi Torres was left scratching his head as setting changes between morning and afternoon failed to eradicate a vague feeling with the front end of his Aprilia RSV4 RF.

The Spaniard suffered a fall in both World Superbike sessions on Friday at Jerez as he continued to have several moments with the front of his machine.

Despite making several machine modifications before FP2, in which he set the third fastest time - the sixth fastest when the morning and afternoon sessions are combined - he found the same issues that afflicted his morning remained.

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"[After the crashes] I am ok," Torres told "I don't know what happened because it's difficult to stop the bike, not only in a straight line but most importantly when I enter the corner. I have a lot of problems with the front here. I make one crash this morning in turn one and I tried to change a lot of things in the bike but no. I had the same problems in the afternoon. It was incredible.

"I change more things in my bike but it feels like I change nothing. In the afternoon I make the same crash and lose the front when I release the brake. I don't understand the bike pushing the front in the middle of the corner. Or when I turn. I don't know what happens. It's completely strange. I want to go fast but my bike gives me this problem.

"More times I close the front but I can control it. One time, ok. Another time, shit! I hit the bump and, bah! This morning we have the same problem. In [turns] one, two, three bumps and then it goes."

The former Moto2 race winner ended the day just 0.2s off Tom Sykes' fastest time in spite of his problems but believes he needs to find two or three tenths of a second in race pace if he wants to challenge the leaders come Sunday.

"I try for this. In this race my objective is not win or make second. My objective is to make one battle with these guys. Maybe I finish fourth or fifth but I want to make one battle. I need 0.2 or 0.3 to get this battle.

"Tomorrow we will try and completely different setting with the geometry, this is the main problem for me. Tomorrow we'll try to get this 0.2/0.3s to catch the top guys."