I have done quads and bikes for near 40 years.
If I do an engine that was flooded (with water), I Drain it, refill. THEN run about 1 to 3 minutes to get warm, and drain again, for a long time.
My small engine buddy (Briggs, Kohler) does 3 flushes. At the cost of a Hydro, I would do at least 1...