An 8-year-old Smithtown boy was in critical condition Friday after suffering a serious head injury in a dirt-bike accident at a private motocross club on the last day of a four-day camp, officials said.

Charles "Chip" Wallshein was hurt Thursday afternoon when he lost control of his dirt bike, fell off and was struck by another rider at MX Club in Ronkonkoma, police said.

He was airlifted by Suffolk County police helicopter to Stony Brook University Medical Center, where he underwent surgery for a skull fracture on Thursday afternoon, his family said.

"You have your heart up in your throat for hours until you talk to the surgeon, who says he's out of the woods," his father, Charles Wallshein of Freeport, said Friday.

Chip also fractured a couple of ribs, his father said, but doctors told the family they did not see trauma to the boy's brain.

"It was an accident," Charles Wallshein said. "Thank God he was wearing all his safety gear."

MX Club owner Mike Rio said the family, including the boy's mother Elizabeth Efthimiou, are longtime members. "This is a motocross family."

The boy's uncle had been a champion motocross racer in his native Greece, said Evangeline Efthimiou, his maternal grandmother.

According to Suffolk County Det. Sgt. Darrell Dabe of the Fifth Squad, the accident happened when a 2009 Honda CR150 operated by Skyler Primack of Briarcliff Manor, Westchester County, struck Chip in the back of his head, just above his shirt collar, after Skyler came over a jump. Skyler, 11, was not hurt, Dabe said.

Both boys were wearing helmets, Dabe said.

Chip and three other riders had been riding on the beginner track at the time, Rio said.

Wallshein said Chip rode at the track about once a week for more than a year. "He's a pretty good rider," his father said. "He's not a daredevil."

The boy, who will begin third grade this fall at Smithtown Elementary School, was operating his 2009 Honda CRF50F motocross bike when he lost control.

Both dirt bikes were impounded for safety checks.

No license is required to ride a motocross bike on private property, Dabe said. He said it was an accident, and no further investigation is anticipated.

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