Inquiry Team constable Kristi Jones said officers had seen an increase in on and off-road, licensed and unlicensed scooters, motorbikes, quad bikes and trail bikes being stolen during burglaries.
They saw a simultaneous spike in reports of juveniles riding the bikes around parks and streets.
During Operation Akasha, police searched six houses ” five in Brookdale and one in Armadale ” and found stolen bikes.
They charged nine people with 26 offences and placed four prolific juvenile offenders under strict curfew conditions.
Const Jones said there had since been a significant drop in thefts.
She said officers had recovered several stolen motorbikes but finding the owners had proved difficult as they seldom took note of identifying features or kept receipts.
She said owners should record VIN or engine numbers and note stickers or identifying features, such as by photographing the bike.
‘Offenders have had easy access to motorbikes, with most in rear yards with minimal security.’
She reminded residents to store bikes out of sight, and use security measures such as padlocks, CCTV cameras, gates or dogs.
Call police on 131 444 to report an off-road vehicle in use on-road or in a park and call Crime Stoppers 1800 333 000 with general information.