The Grand Prix, originally scheduled for 24 April, was moved to 2 October due to the effects of the Tōhoku earthquake and the Fukushima I nuclear accidents.

[4][5] Due to concerns with possible radiation an independent survey of Motegi and the surrounding area was commissioned by FIM and Dorna Sports.

That survey generated a preliminary report[6] which stated "Based on the estimate dose it can be said by no doubt that the radiation risk during the race event is negligible."

On 2 August the full report was received and the organisers stated that the race would take place as scheduled.

[7] Below are the standings for the top five riders and constructors after round fifteen has concluded.