A dounut float floats and aligns against hinge, float should be parallel to carb squared base, that's on 2 strokes engines, probably same carb building type used on 4 strokes ? Your carb probably needs a good soak in carb clean formula for some hours specially if it's a 2 strokes.
They usually have running problems and its usually mixture problems as they are set very lean from the factory. But as said its under warranty get it fixed by your dealer!!
