Suzuki riders Aleix Espargaro and Maverick Vinales will receive long-awaited engine upgrades for their home MotoGP event at Catalunya this weekend.

The new GSX-RR has shown impressive handling - and proven especially effective with the aid of the softer rear tyre in qualifying - but has often been out-gunned in a straight line during the races.

The lack of engine output is a hangover from the reliability problems experienced at the end of last year - Espargaro being slower than all but the ART of Alex de Angelis last time in Mugello, which features the fastest straight on the MotoGP calendar.

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"My GSX-RR has proved to be performing well during this early part of the season and my feeling is that we still didn't get the results we deserved," Espargaro said.

"In Barcelona we will get some new parts and I'm very curious to see how the machine will be improved, I know that in Japan our engineers are working very hard because we fully believe in the project, so I'm looking forward to do my best and make a positive weekend."

Rookie Vinales - who celebrated a career best seventh at Mugello, matching the best Suzuki finish to date for Espargaro - is equally curious, and confident.

"I'm pretty confident that I will enjoy the Circuito de Catalunya on the Suzuki, it's a fast track and our machine proved to be very good to ride thanks to its chassis," he said. "Plus we will get improvements for the engine of our machine, I'm really curious.

"I'm aware that I still have a lot to learn, in particular my team and I are working on the management of the sessions and the tyres, to improve the pace but also to be more effective in qualifying and to enter Q2 to have a good position on the grid. This will be key for the future."

Espargaro, who suffered a thumb ligament injury at Le Mans and was then taken out by Danilo Petrucci last time at Mugello, will ride with a special helmet livery in Sunday's race.

Suzuki is now the only MotoGP manufacturer without a seamless shift gearbox. It remains to be seen if the race team will debut the technology during Monday's post-race test.