Though Mr Fehintola’s exact speed has not been confirmed, witnesses estimated it to be between 50 and 60mph.
Forensic crash investigator Aiden Whiteley told the inquest that the faulty throttle meant the teen would not have been able to slow down and the defective back brake would have given the rider even less control.
The friend who was with Mr Fehintola at the time said in a statement he could hear him shout “the revs are sticking” and “it won’t stop” before hitting the tree “in the blink of an eye”.
The electric motorbike was not road legal, had no registration and had also been hot-wired so it could be started without a key, the crash investigator added.
The inquest also heard Mr Fehintola was “not a confident driver” and was not wearing a helmet at the time of the crash.
In a statement his family said he was the youngest of five siblings so “the baby of the family” and loved spending time with his brothers and sisters, especially during Ramadan.
Mr Fehintola also loved football and sport and had always been a “happy child”.
The family said previously: “He was bold and hardworking, ambitious and resilient.
“His radiant smile consumed any room he graced.”
Assistant Coroner for West Yorkshire John Hobson recorded Mr Fehintola’s cause of death as extensive brain injury from a road traffic collision.
He said that while he could not definitely determine how fast the teen had been going, he was certainly driving “at speed”.
Mr Hobson told Mr Fehintola’s family: “He was only 18.
“This is a very sad situation and it is a tragedy to sit at the inquest of someone so young.”