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The engines don't HAVE to be derived from production ones. Thay MAY be so. If Ducati decided to build a version of the Desmocedici engine with 81mm diameter pistons and make that available to anyone, that would be legal too. The same goes for Aprilia building a chassis derived form a production one and making that available to everyone, not to mention the motor. If they want to be in MotoGP by selling chassis to people and providing close support to them, good on them. They get the exposure and the teams get to race, therefore exist, at a fraction of the cost