Jorge Lorenzo may have set the pace at Sepang on Friday but the Championship hopeful says more work still needs to be done.
The Yamaha rider arrived at Sepang for the third race in MotoGP's triple-header determined to make history.
Lorenzo has never won at the Malaysian circuit in the premier class and a victory – and the 25 points – are desperately needed for his championship quest.
Putting aside the growing tension within the Yamaha camp, Lorenzo had a near perfect start to the weekend.
He was second quickest in FP1 before overhauling Dani Pedrosa in the afternoon's session to finish the day quickest of all.
His best time was a 2:00.246 while Championship leader Valentino Rossi was P8 and a full second off the pace.
"We are working very well on the setting of the bike," the Spaniard said.
"We have a good pace both with the old and the new tyre, we just need to improve some details, but overall it's good.
"This afternoon it was very hot. It will depend on tomorrow's weather, but I think the bike can be further improved so I can better my lap time."
Lorenzo is second in the riders' standings, 11 points behind his team-mate.