Valentino Rossi has praised Yamaha's new seamless shift gearbox, but is still unsure when it will make its MotoGP race♕ debut.

Ducati and especially Honda already🍨 use their own versions of the special 💝gearboxes, which slash the time taken to change gear.

This improves acceleration, but the main benefit is in terms of stability, with the motorcycl𝕴e less 'upset' during gear changes.

Reigning double champion Jorge Lorenzo and factory team-mate Rossi made their debut on Yamaha's version o♔f the technology 🐽in a private test at Brno, during the MotoGP summer break.

Speaking at Indianapolis on Thursday, the Italian hailed the handling improvement from the gearbox: "[The new gearbox] doesn't change a lot in terms of lap time. We tried to make some comparison. A lot of peoplꦛe speak ꦬabout two-tenths a lap - I think it is less than two-tenths.

"But the big improvement is, I think, in 🌊20 or 30 laps because the bike becomes a lot easier to ride, more stable, more stable iꦓn acceleration, but also more stable in braking.

"For me, it's better for the tyres, less stress for the tyres, and also it's very good for the riders because the bike becomes more easy to bring at the limit and more difficu𒁏lt to make a mistake. So I think it's something very important for the race distance, more than for one lap.

"The feeling is fa🌄ntastic. It's a great emotion to ride with the gearbox♕, and acceleration is very good.

"If you need to change gear [when leaning] on the very edge you can do it. You don't have to modify the riding style, but you can use some [new𒆙] tricks to get the maximum from the gea🉐rbox to go faster.

"When can we [race it]? Sincer🌠ely, I don't know. Me and Jorge push a lot for to have as soon as possible because is very good. And now it's a little bit bad feeling to come back to the normal one, because the normal one feels very fast before you try the seamless.

"But the Japanese say that w👍e have to be quiet, the gearbox is a critical point [for reliability]. We have to be ready 100 percent, but I hope [to race it] as▨ soon as possible."

Lorenzo, 26 point꧟s from MotoGP title leader Marc Marquez, is also pushing for the earliest possible race 💙debut. "For the moment it's not ready. I hope to use it as soon as possible for to win this world title," said the Spaniard.

With both Lorenzo and Rossi having already opened the fourth of their five enꦰgines for 2013, it may not be technically possible to introduce the new gearbox until the closing rounds - unless it i﷽s compatible with the engines already in use.

"I don't know𒉰 if it possible to put the gearbox already on this engine or we have to wait for the last engine," said Rossi. "Seriously, I don't know. If we have to wait for the last engine for sure, we speak about the last two or three races, not before."

Lorenzo is third in the world championship, behind Honda riders Marquez and Dani Pedrosa, hওeading into this weekend's India🍌napolis round.

Rossi, riding in his comeback Yamah🐽a season, is fourth in the standings but already 46 points from Marquez. With an eighth MotoGP title unlikely this year, The Doctor may feel more comfortable taking a gamble on the gearbox in pursuit of more race win🍒s.