The month long MotoGP summer break couldn't come soon enough for Yamaha's reigning title holder Jorge Lorenzo, who fractured and then re-damaged his newly plated collarbone in successive events at Assen and the Sachsenring.

Despite two rounds of surgery the brave Spaniard only missed one race, riding injured at Assen and then Laguna Seca, but couldn't prevent rookie Marc Marquez pulling a 26-point championship lead.

Marquez's Honda team-mate Dani Pedrosa, who also injured his collarbone in Germany, is ten points ahead of Lorenzo as the series restarts at Indianapolis this weekend.

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During the summer break, Lorenzo and team-mate Valentino Rossi took part in a private test session at Brno, when the Spaniard was able to gauge his strength.

"We are returning to the USA and beginning the second half of the year, which may be the toughest. I was able to rest for some days after Laguna Seca and then we went to Brno to make a private test with Yamaha," said Lorenzo.

"Those two days gave me an opportunity to check my physical condition. I'm a bit tired, especially because after two crashes in Assen and Sachsenring I couldn't recover so much and now we have to manage a long period with three races in a row.

"I feel better obviously than in Laguna but still need time to recover to 100% and it is not going to be easy because the calendar is so busy and also we have to fight not to lose points.

"In any case, we go to Indy to give everything despite the circumstances."

Yamaha is understood to have handed Lorenzo and Rossi a seamless shift gearbox, as already used by Honda and Ducati, to try at the Brno test.

The factory is yet to confirm a race debut for the new gearbox, but with both Lorenzo and Rossi having already opened the fourth of their five engines for 2013, the gearbox may not be seen until the closing rounds - unless it can be fitted to the existing engines.

Team manager Wilco Zeelenberg gave little away regarding the technical side of the test: "The test was not so bad, first because both riders were happy with the results and secondly, from our side, Jorge did a good job.

"The first day he struggled a bit to find the rhythm but on the second day he improved a lot and was able to get the pace. This test was really important for Jorge to check his fitness after a tough month where he had managed two serious injuries in the collarbone with two surgeries in ten days.

"Jorge has got more confidence after the test and now we travel back to the USA with positive feelings. The track is not one of Yamaha's favourites but we hope all the work we made in either Motorland and Brno will be useful to fight in the second part of the season."