Having branded the Czech Republic Grand Prix the 'worst race of his career', due to 'no grip at the front and no grip at the rear, from the first lap to the last', Dani Pedrosa failed to find any improvement from revised rubber brought by Michelin to Brno on Monday - prompting the Spaniard to abandon the two-day test after just eleven laps.

"We tried some different front tyres that Michelin brought here for this test, but we finished after some laps because we couldn't find any improvement," he declared.

The double 2008 race winner, who holds an increasingly distant third in the world championship standings, had been due to ride Honda's pneumatic-valve engine - used by team-mate Nicky Hayden since Donington Park - during the test, but said there was simply no point.

"We tested the tyres with my current [valve-spring] race bike, there was no point using the machine with the pneumatic-valve engine because the tyres weren't working well enough," said Pedrosa. "We have rescheduled this test at Misano, on the Monday after the San Marino GP."

There was still one pneumatic Honda out on track on Monday, however, with HRC test rider Tadayuki Okada called up to replace the injured Hayden.

The former 500GP race winner, who gave the pneumatic-valve RC212V its race debut at June's Italian GP, put in a full day of riding as he tested updated engine parts and electronics.

"Today we tested some new steps in development concerning both engine and electronics. In Japan we are working on the development of both the spring-valve engine and the pneumatic-valve engine," said Tady, who set the slowest lap time of the 19 riders.

"Since my last appearance at the Italian MotoGP I can say that the bike with pneumatic-valve engine has improved a lot," he insisted. "I think that the bike has reached a satisfactory level of development, I hope that Dani will be able to test it soon."

While still a title contender, Pedrosa is cautious about switching from the proven valve-spring engine until he feels the delayed pneumatic design shows a clear, and reliable, performance advantage.

With Repsol Honda packing up one day early, Okada, like Pedrosa, will not test on Tuesday.