Repsol Honda's Casey Stoner is still suffering with chatter from the front-end of his 1000cc RC213V and is having to change his new HRC-built steed in order to try and iron it out to get some more feedback from the 2012 chassis.

Bridgestone brought their latest set of tyres which will be used next season to the Valencia test and Stoner said that he can't get as much mid-corner feedback as he wants even though his style is not to run as much corner speed as some other riders on the grid.

"We're struggling a bit with the new tyres, we're finding they give us a lot of chatter in the bike. We compared the bike to the one we tested in Brno and Jerez and we've found some improvements in a lot of ways with the chatter but we've still got to do a bit more," said Stoner, speaking to bikesportnews.com.

"We found that with the 2012 Bridgestones we have had to make a chassis that will work a little better with the chatter. We have reduced it to a certain degree but it is something we really have to focus on and adapt to the tyres a little better. We're not too comfortable with the front mid-corner and we're struggling to get good feedback from it. The rears are working great with a really even wear pattern.

"It was good to feel the horsepower, even in fifth gear it still wants to spin up and go sideways at the speed we're doing so it's a lot of fun and something I am looking forward to trying at different tracks. There are a few other small parts of the bike we want to improve but it's a question of getting comfortable with it and used to it."