Aaron Yates will be the sole representative of Erik Buell Racing's much anticipated World Superbike race debut at Phillip Island after team-mate Geoff May was ruled out through injury.

May, who has been the quickest of the two American riders so far this week, had been well placed to get his Hero EBR 1190RX into Superpole as he contested a spot inside the top twenty against more experienced rivals.

However, a crash during FP3 would leave May nursing a fractured left collarbone, with the decision taken not to start the races as a result.

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"What happened to Geoff is a real shame," said team manager Giulio Bardi. "We had been making steps forward with the bike every time we go on track which is really encouraging for us. We were hoping Geoff could make a few laps to allow us to continue to evaluate the data but then he crashed. The main thing is that he is not too seriously hurt and should make a full recovery for Aragon.

Yates will start both races from 23rd position on the grid having made substantial improvements on his lap times over the course of the week.

"We made some changes and I am starting to get more feel from the rear now which means we are picking up with drive, so all in all we are moving in the right direction. All that counts at this stage is for us to keep collecting data and from there we can keep taking steps forward.

"We arrived here with some completely new aspects of the bike so of course we have had to make adjustments. We are a little bit off the pace but tomorrow the plan is of course to finish both races and if we can pick up a tow, anything could happen."