Lorenzo wants the gearbox fitted to his bike for the remaining eight races of the season, starting with the Czech Grand Prix this Sunday (Aug. 25).
He has vowed to back his demand by declaring he can win both the Czech and British GPs, which run back-to-back over the next two weeks.
Lorenzo feels the absence of an F1-style seamless gearbox contributed towards his defeat at Indy where Marquez won his third race in a row for the season on a Honda.
“But without the gearbox we are always at the limit and risking so much.”
The Honda 1-2 assault at Indy has strengthened Lorenzo’s view that the slick-shifting seamless gearbox is now crucial in his bid to overhaul Marquez and Dani Pedrosa.
Honda has used the seamless system for three seasons on their RC213V.
After two laps of the Indy race, Lorenzo had opened a 0.5-second gap on Pedrosa and Marquez. That lead was gradually but decisively eroded when Marquez took the lead on lap 13 of 27.
“With the new gearbox instead of gaining just half a second at the beginning of the race maybe I could make one second or 1.5 seconds and try to win,” Lorenzo said.
“The advantage I took at the beginning was not enough to hold and also at Indy I had this strange problem with rear tyre grip at the end of the race.
“I’m disappointed not because I didn’t win the race, this was almost impossible, but because I lost second place which was virtually assured for me.”
Yamaha’s seamless gearbox was tested at Brno the week before the Indy GP but Yamaha is reluctant to race it fearing unreliability.
But the stunning pace of Honda’s RCV213 and Marquez is giving them little choice, according to Lorenzo.
“In my opinion we have to take some risks. We are 35 points behind and if we don’t take some risks then maybe the championship will be over,” he said. “But it is also important that the gearbox won’t have any problems. Yamaha is conservative on these things.
“The lap time difference is not big but the real advantage is over the race distance.”
Lorenzo needs a boost in defense of his 2012 world championship having lost crucial points with two painful collarbone injuries, one suffered at the Dutch TT and another in Germany.
Although only delivering a small gain in lap time the seamless system adds to rider confidence with smoother upshifts at lean angle under acceleration.