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."

The £80,000 needed for a monument to Alice Hawkins was given in one donation from a city businessman.
Ms Hawkins, a shoe machinist, helped lead the Suffragette campaign in Leicester and gave speeches in London.
Her grandson said the statue would be in recognition of all the women who fought for universal suffrage.
The anonymous donor had originally pledged some of the funds needed for the artwork but was moved to donate the full amount after watching the film Suffragette.
Ms Hawkins' grandson, Peter Barratt, said the donor had "made dreams and ambitions come true".
"The statue will feature Alice but it is in recognition of all the women in the Leicester Suffragette movement 100 years ago, to gain a basic human right that that we all have today."
Ms Hawkins left school in Stafford in 1876 to start work as a shoe machinist, later joining Equity Shoes, which encouraged workers to take part in political activism.
From there she joined the Women's Social and Political Union (WSPU) and was one of 18 women to be jailed when they were charged by mounted police in Hyde Park in February 1907.
After her time in prison, she organised meetings and protests in Leicester, inviting Sylvia Pankhurst and helping form the city's section of the WSPU.
She died in 1946, aged 83, and was buried in an unmarked pauper's grave.
Mr Barratt said he was now inviting ideas from artists for the statue and hoped it would be put up in about 18 months' time.

The former international moved to Linfield last summer but he had limited game time at Windsor Park because of injury and was eventually released.
Clingan's cross-channel career included spells at Norwich City, Coventry City, Nottingham Forest and Kilmarnock.
The midfielder, who won 39 Northern Ireland caps, lined out for Glenavon in a pre-season friendly against Loughgall on Saturday.
Glenavon open their Irish Premiership campaign with a contest away to Warrenpoint Town on Saturday.

Neil Jackson, 35, of Penylan, Cardiff, posed as a landlord online and took £12,840 from nine people but failed to let the three-bedroom home out.
He took deposits before repeatedly cancelling move-in dates claiming his son was battling cancer and had died.
Jackson previously admitted fraud at Cardiff Crown Court.
Andrew Kendall, prosecuting, said Jackson told his victims he needed £1,400 to secure the property and arrange a move-in date only to later claim he could not drop off the keys to Cardiff because his son was ill in Plymouth.
"He'd say things like he blamed nurses for not stitching his son back properly and even told one victim his son had died," he said.
Mr Kendall said the lies had a "great impact" on some victims, with one couple left homeless and another left living in a caravan.
He also pressured one woman into borrowing money from friends and selling possessions so he could "reserve" the home for her.
Mr Kendall said Jackson was eventually found out when some victims found news reports on him being jailed in 2012 for again using his two-year-old son to defraud £60,000.
The former Tesco store manager tricked his workmates for three years, claiming he had cancer and his son had cerebral palsy.
Staff donated money to pay for private treatment but he used it to fund holidays to Las Vegas and Hawaii.
David Pinnell, defending, said Jackson was "genuinely remorseful" and had used the money to pay off debts to people who protected him in prison.
Jailing him for two years, Recorder of Cardiff Eleri Rees, told him: "You have to understand given your track record for elaborate lies the court finds it hard to take what you're saying at face value.
"Some of the victims were in precarious financial situations so the impact on them has been very serious. Others ended up living in a caravan."
A man has died after apparently being thrown from a go-kart at a track.
[NEXT_CONCEPT]
A statute to a Leicester woman, jailed five times for her part in the Suffragette movement, will be built after an anonymous donor came forward.
[NEXT_CONCEPT]
Glenavon have signed ex-Northern Ireland midfielder Sammy Clingan.
[NEXT_CONCEPT]
A man who falsely claimed his son had died from cancer to scam would-be tenants out of thousands of pounds has been jailed for two years.