The boys, aged 17 and 16, were the rider and pillion passenger of an unregistered blue Yamaha trail bike that reportedly crashed with a white Holden Colorado utility at the intersection of Tompsons Lane and Franmaree Road about 6pm.

Police said the 17-year-old rider, of Mayfield, and 16-year-old pillion, of Newnham, were thrown from the bike and received significant injuries.

They were both transported to hospital in a critical condition.

As of Saturday morning the 17-year-old remained in a critical condition, the 16-year-old stable.

Initial investigations indicated the crash occurred when the utility turned right from Tompsons Lane onto Franmaree Road, hitting the trail bike which was travelling east.

Police said the unregistered Yamaha was not fitted with any lights and the riders were wearing dark clothing and no protective gear.

Neither was wearing a helmet and the visibility of the Yamaha is believed to be a contributing factor to the crash.

The driver of the utility, a 42-year-old Newnham man, was uninjured and taken to the LGH for mandatory drug and alcohol testing.

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