High Quality Content by WIKIPEDIA articles! The 1977 Yugoslavian motorcycle Grand Prix was the seventh round of the 1977 Grand Prix motorcycle racing season. It took place on June 19, 1977 at the Circuit d`Opatija. The event was marred by 2 fatalities, and this turned out to be the last Yugoslavian motorcycle Grand Prix at Opatija. The event moved to the further inland Rijeka circuit.