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1. Why are only Ducati, Honda, and Yamaha in MotoGP? What happen to Kawasaki, Aprilia, Triumph, BMW? I suppose this only applies to MotoGP1.
2. Why are engines supplied by Honda in MotoGP2?
3. What types of bikes run in MotoGP3? Honda CBR250 & Kawasaki Ninja 250?
4. Who are better riders: MotoGP, AMA, WSB? What are the differences? Is MotoGP like the World Series, SuperBowl, Stanley Cup for motorcycle racing?