MotoGP world champion Jorge Lorenzo is confident he has taken a chunk out of one area where he feels Honda has an advantage over Yamaha.
Honda riders have been quickest on each of the four days of 2011 testing to date, but traction gains helped Lorenzo finish third on day one of the second Sepang test.
“We worked to improve the traction and finally we found something to help us a lot and I'm very satisfied with this,” said Lorenzo.
“Honda still has more power than us, but at least we improved the traction. Before we had less traction and less power than them. Now I think we have improved the traction a lot, so we need to work a little more on the engine.
“It will be difficult to have a better engine [from Yamaha] for the beginning of the championship, but maybe looking forward we can have it. The only way we can improve the engine we have now is traction and braking, so these are the areas we are working on with set up.
“With the improvements we've made we can now brake a little later and enter the corners a little more quickly as well, so I was able to do some good fast consistent lap times this afternoon when it was still very hot on the track."
Team-mate Ben Spies spent his morning getting used to his bike after the break then worked on some different suspension settings.
The Texan finished the day in sixth, 0.82sec from the front, having used just two sets of tyres over the day.
"Today we came to this test with the engine configurations we're going to race with so both bikes have that, said Spies. “We just warmed up in the morning and spent the afternoon on one set of tyres. We set our fastest lap of the day when it was very hot and mid race distance on a hard tyre. We're saving some tyres for the end of the test when the track's good.
“We worked on some race set up and I also worked on some different riding styles. We'll start again tomorrow with plenty more to do. We tried a couple of shocks and found a few tenths and were still consistently fast on used tyres which was promising. It's definitely a good day and I'm happy with it."
Repsol Honda riders Casey Stoner and Dani Pedrosa were first and second on Tuesday.