Ducati's Nicky Hayden is finding life at Motegi particularly tough as the harsh braking required at the Twin Ring circuit affects his injured right hand.
Hayden sustained a broken radius bone after a frightening crash at Motorland Aragon in Spain and the 2006 MotoGP world champion slipped to 10th in the afternoon times after ending FP1 in seventh.
Hayden, who is a massive one-and-a-half seconds behind opening day leader Dani Pedrosa at Honda's home circuit, said: “It was good to have a full day of dry weather on a Friday, but it was a difficult day.
“This morning we weren't so far off, but I didn't improve in the afternoon. I'm not getting the feedback from the bike that I'd like under braking.
“Also, my hand is giving me some pain and I don't have a lot of strength, especially into the right-handers.
“There's lots of hard braking on this track, so I'm losing time mainly on the corner entry, and it's hard to recover on the exits,” he added.
“We need to have a re-think tonight and try to do a good step tomorrow.”