MotoGP championship leader Jorge Lorenzo admitted that the new engine Yamaha delivered for Monday's Barcelona test did not deliver much.
Assessing the revised engine was one of the priorities for the Catalunya Grand Prix-winning team, but after going eighth quickest Lorenzo conceded he had hoped for a bigger step.
"We tried a new engine spec yesterday that in theory is more powerful," said Lorenzo. "Until now we didn't find any big improvement, some little advantages and some little disadvantages."
Lorenzo's teammate Ben Spies, who was second-fastest, was also slightly underwhelmed.
"The engine spec was a little improvement but you know riders, we always want at least 6mph faster on the straights..." he joked.
Yamaha will resume testing at Aragon on Wednesday, when Lorenzo reckons changing the electronics set-up might help the new engine's performance.
"In Aragon we will try some modifications to the electronics to see if we can gain something," he said.