A motorbike rider who died during a social ride at a motocross complex had a medical episode last month, the Wollongong Motorcycle Club confirmed.
Appin resident Neville Turner, 51, could not be saved after his bike left a lower-speed practice track and hit a tree about 10.30am on Sunday, June 30 at the Mount Kembla club.
Club president Paul Treverrow said Mr Turner suffered a brainaneurysm which caused him to pass out on the bike. Mr Treverrow was told by a Turner family spokesman.
He said Mr Turner's death had been a "devastating" loss for family, friends and the Mount Kembla motocross community.
Mr Treverrow said it was a rider's responsibility to ride as safely as possible.
"In this case, Neville blacked out and that resulted in the accident," he said.
"Riders need to ride to the conditions of the track just like drivers would do if the road was busy or there were pedestrians.
"Riders need to factor the conditions into their speed such as if the track is muddy, dusty or there are lots of riders. They also need to ride to their own limits.
"Rarely is there an 'accident' that is the result of negligence from track owners or builders."
The death was the first fatality at the complex in more than two decades and Mr Treverrow said the club provided a controlled environment for riders that was monitored by officials and medical staff were on site.
He said officials had walked around the track following the accident and did not identify anything that could have contributed to the accident. He said the track was regularly maintained.
"We can't do much more and we can't chop down every tree at the site because that is not feasible."
The club is holding a community fundraising event to celebrate Mr Turner's life on July 20.
There will be signed jerseys from professional motocross riders, giveaways and a lap of honour.
All the takings from the gate, ride fees and donations will be given to Mr Turner's family.