A motorcycle rider was arrested in Fairfield West after he allegedly fled the scene of a crash in Kogarah on Monday.
About 5am, emergency services were called to the Princes Highway, near Gray Street, after reports a Suzuki DRZ400 and Hyundai Excel collided.
Bystanders helped the rider to remove clothing on fire, before he allegedly fled the scene.
His pillion passenger, a 15-year-old boy, was treated at the scene for head injuries, and later taken to Westmead Children's Hospital,where he remains in a serious condition.
The driver, a 56-year-old man, was uninjured.
Officers from St George Police Area Command attended and commenced a search of the surrounding area, with assistance from the Dog Unit, however, the rider was not located.
Following extensive inquiries, officers from Fairfield City Police Area Command stopped a vehicle on Corona Road, Fairfield West,and arrested the rider, a 20-year-old man.
He was taken under police guard to hospital, where he was treated for a burn to his leg.
The man was later released and taken to Fairfield Police Station, where he was charged with take and drive conveyance, negligent driving occasioning grievous bodily harm, fail to render assistance and driving while disqualified.
He was refused bail and is due to appear in Fairfield Local Court today.