South West District Police are investigating a crash that occurred near Jarrahwood, 26 kilometres north of Nannup on Sunday morning.
Police report at about 10.30am, a small group of motorcycle riders were travelling on Jarrah Log Road off Vasse Highway when one of the riders lost control of his Suzuki motorcycle on the gravel road and hit the road.
The man in his sixties received serious injuries and was treated by fellow riders.
St John Ambulance attended and conveyed him to the Nannup town site where the rescue helicopter airlifted him to Royal Perth Hospital.
The man’s injuries are not considered life threatening.