Hills Fleurieu police and the Strathalbyn community have worked together to catch four males allegedly involved in the theft of a dirt bike on Tuesday, September 4.
Police were called to the Ashbourne Road area about 9am, when three youths were seen making off with an allegedly stolen motocross motorbike.
Soon after, someone was seen riding the motorbiked recklessly within the township.
Further reports led police to where two Strathalbyn boys, a 15-year-old and a 16-year-old, were found unlawfully on premises, and they were arrested.
A 20-year-old Strathalbyn man was arrested shortly after for illegal use of a motor vehicle and being unlawfully on premises.
The trio was also charged with theft after allegedly stealing food from a local service station.
The next day, police arrested an 11-year-old Strathalbyn boy in relation to the crimes, after further investigations.
The males were released on bail with strict conditions and will face court in Mount Barker in October.
Hills Fleurieu LSA acting officer in charge Inspector Gus Sickerdick thanked locals for "their ongoing assistance in relation to this reckless behaviour of these youths".
"Not only does this type offending risk their own lives, but they have a blatant disregard for the safety of every of other road users and members of a our community. Their behaviour will not be tolerated," Insp Sickerdick said.
He urged people to secure motorbikes and quad bikes when not in use.
Anyone who sees suspicious behaviour is asked to call the police assistance line on 131 444.
Anyone with information about crime can report it to Crime Stoppers on 1800 333 000 or at www.crimestopperssa.com.au