The victim, in his 60s, had been karting at the Ellough Park circuit in Suffolk on Sunday afternoon.
Ambulance crews found the man unconscious and not breathing when they arrived at the track near Beccles and treated him at the scene but he died there.
Suffolk Police have started an investigation into the death, working with Waveney District Council.
More updates on this news story and other stories in Suffolk
A spokesperson for the council said: "As part of our responsibility for health and safety issues, our Environmental Protection team are working with Suffolk Police regarding this incident to establish the course of events."
A man has died after apparently being thrown from a go-kart at a track.