futuristic racing pilots race plasma-powered bikes in an intergalactic Grand Prix at speeds that are over 750 km/h making it the second fastest racing game on the Nintendo 64, only beaten by F-Zero X. 

There is another game, Star Wars Episode 1 Racer. You can go over 1000 MPH in that game, I've gone like 1200 MPH at the fastest so that's 1931 KPH. A lot faster than this game, not sure if it's faster than F-Zero X.