Mid season bike Mod question.

In MotoGP what are the rules on what can be changed on the bike mid season? Do teams present the years model before the beginning of the season and stick to it or can they adjust anything during the actual season?

In MotoGP what are the rules on what can be changed on the bike mid season? Do teams present the years model before the beginning of the season and stick to it or can they adjust anything during the actual season? http://ifttt.com/images/no_image_card.png