About 5pm on Friday, police were conducting a stationary speed enforcement operation in Ashmont when officers spotted a Mercedes-Benz and a green motorcycle travelling "well above the signposted speed limit of 50km/h".

A NSW Police statement said the drivers were going 128km/h and were stopped by officers.

The Mercedes driver, a 25-year-old Glenfield Park man, and the Kawasaki motorcycle rider, a 21-year-old Kooringal man, were charged with taking part in a street race and exceeding the speed limit by more than 45km/h.

Both the driver and rider had their licences suspended on the spot and vehicles confiscated for a period of three months.

Police said the drivers are responsible for the towing and holding fees.

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