Has a FIBA World Cup game ever ended 86-43?
Exactly once. On September 13, 2018, Germany beat Estonia 86-43, and no FIBA World Cup game before or since has ended that way. When it happened it was a scorigami, the first 86-43 in league history.
That makes 86-43 the 475th most common final score out of 1,178 that have ever occurred in FIBA World Cup. One point away, 87-43 has happened never and 86-44 has happened never.