Dani Pedrosa proved his decision to request the prototype 2013 Honda RC213V for this weekend's US MotoGP had been a good one by leading both of Friday's free practice sessions at Laguna Seca.
Pedrosa and Repsol team-mate Casey Stoner were handed the new bike to evaluate during the recent post-race Mugello test and, despite only limited laps, Pedrosa wanted to run the revised machine this weekend.
The Spaniard also has the 'standard' 2012 RCV available, but his best Friday laps were with the new bike - which features a different engine and chassis.
Pedrosa, seeking to close a 19-point gap to championship leader Jorge Lorenzo, finished the day 0.334s ahead of the Yamaha rider and comfortably under the race lap record.
"We did a good job today, we managed to get a good lap time in the morning and improved it in the afternoon, although the grip level was very poor and we struggled a bit with the rear," said Pedrosa, the 2009 Laguna Seca winner.
"The tyres were working a little better in the afternoon, but it was hard to work on the consistency due to the lack of grip.
"I hope to be able to work on the pace tomorrow to prepare for the race. The new bike is working good here, I will continue working on the set-up tomorrow".
Team-mate and reigning champion Casey Stoner, who also requested the new engine but with the original chassis, was third quickest in both sessions.