A 63-year-old Pixley man was seriously injured when he was thrown from his motorcycle east of Porterville on Wednesday, the California Highway Patrol said.
The accident happened shortly after 4 p.m. on Reservation Road, east of Highway 190.
Arnold Martinez was traveling approximately 45 mph when he made a wide turn on the mountainous road and lost control of his 1981 Suzuki.
He was transported to Community Regional Medical Center in Fresno.
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The accident is still under investigation, but drugs and alcohol are not considered to be a factor, the CHP said.