A motorcyclist was rushed to Royal Perth Hospital with serious injuries after coming off his bike in Asby last night.
Traffic Enforcement Group officers are investigating the crash which happened just after 8pm on Carosa Road.
Police say the motorcyclist lost control of his black Harley Davidson and crashed into a parked Volkswagen Golf.
The rider, a 46-year-old man, received serious leg injuries and was taken by St John Ambulance to Royal Perth Hospital.
Anyone that saw the crash, or the motorcycle prior to 8pm, should call Crime Stoppers on 1800 333 000 or to make a report online at crimestopperswa.com.au