Repsol Honda's Dani Pedrosa is seeking better traction from his RC213V in preparation for Saturday's Dutch MotoGP.
Pedrosa was sixth fastest on the opening day of free practice, when he worked on improving the chatter issue on his Honda and experimented with different set-ups - including another chassis - and both the soft and hard compound rubber.
The top three fastest riders on day one – Ben Spies, Cal Crutchlow and Nicky Hayden – posted their fastest times in the afternoon on a soft rear tyre, but Pedrosa and his Repsol Honda team-mate Casey Stoner continued to use the hard compound tyre in the higher afternoon temperatures.
Pedrosa, second fastest in the morning session, was just 0.2s behind Spies at the conclusion of day one.
“It's been very good to have these temperatures in Assen and it really helps us to take profit of both practice sessions to work on the set-up of the bike,” he said.
“We tried different things on the chassis to improve our feeling with the front tyre and we did many laps on both tyres, the soft in the morning and the hard in the afternoon.
“We are pleased with the steps we made today and I think we have a good basic setting to keep improving tomorrow.
“Basically, we would like to get better traction to give us more corner speed.”
Assessing the chassis he tried, Pedrosa noticed only 'slight differences' but said he needs more time to experiment to gain a truer picture of the pros and cons of the different configurations.
“Concerning the chassis we tried, I felt slight differences, but I still need to compare them a little bit more because we are looking to improve the performance with the front tyre and Assen doesn't really have hard braking,” he said.
“It's impressive that the lap times are so close from the first to the eighth position, it means that tomorrow's qualifying will be tough and here it's important to get a good position on the grid because the first corner is very tight.”