INDIANAPOLIS - AUGUST 18: Jorge Lorenzo of Spain and Yamaha Factory Racing looks on during the press conference at the end of the MotoGP race during the MotoGp Red Bull U.S. Indianapolis Grand Prix - Race at Indianapolis Motor Speedway on August 18, 2013 in Indianapolis, Indiana.

Photo Credit: Mirco Lazzari gp/Bongarts/Getty Images

world champion is piling the pressure on to upgrade his factory M1 with a seamless shift gearbox, as he mounts an increasingly desperate defense of his title.

Lorenzo wants the gearbox fitted to his bike for the remaining eight races of the season, starting with the 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’s plea comes following his third place finish in last Sunday’s , which dropped him to 35 points behind championship leader .

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 .

“I think at and , when I will also feel a little better than at Indy, that with the new gearbox I can win these races if nothing strange happens.” Lorenzo said.

“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 .

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.

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