Tributes are flowing for a “larger-than-life” teenager who was tragically killed when an electric motorcycle he was a passenger on collided with two cars in Melbourne’s north-east last night.

Max Foster, 15, was a pillion passenger on an electric motorbike that collided with two cars near Plenty Road in South Morang about 5.30pm yesterday.

Max was treated at the scene for life-threatening injuries but sadly could not be saved.

Max Foster, 15, was a pillion passenger on an electric motorbike that collided with two cars near Plenty Road in South Morang about 5.30pm yesterday. (Nine)

The motorbike rider, a 17-year-old boy, was taken to hospital with non-life-threatening injuries.

Max’s friends today gathered to honour him.

“He was the most loving kid I’ve ever met, one of the most realest people, he would always back me up in any situation,” friend Luca Nogarotco said.

“He was always there for me, I was always there for him, but unfortunately he’s passed away now. He’s gone too soon.”

“He was the first person I spent my lunch with at his school, he was great. He had a big heart, he was very friendly, he had a great sense of humour,” Joacph Yatwob said.

Max’s school paid tribute to the teen in a statement.

Tributes are flowing for a “larger-than-life” teenager who was tragically killed when an electric motorcycle he was a passenger on collided with two cars in Melbourne’s north-east last night. (9News)

“Max was a valued member of our college community, and his passing is a heartbreaking loss for us all,” the school said.

“Max was a larger-than-life personality, who endeared us with his warmth, humour, positivity and embraced us with a charm and smile that will always be unmistakingly Max.

“Forever in our hearts.”

Acting Assistant Commissioner Justin Goldsmith has confirmed the bike was illegal and unregistered.

“The motorcyclist has gone through a red light, clearly a red light, and has collided with a vehicle going in the opposite direction,” Goldsmith alleged.

Max’s friends today gathered around the scene to honour their friend. (Nine)

“It was an illegal motorcycle that was incapable of being registered in Victoria because it doesn’t fit the safety category to be registered in Victoria.”

Witnesses claim only one of the riders was wearing a helmet.

The tragic crash has sparked renewed safety warnings about the dangers of illegal e-bikes and scooters.

“The vehicle that we are talking about last night is capable of going 90 km/h, and it’s in the hands of children and there is unfortunately a glut of them on the market,” Goldsmith said.

There are also calls for the state government to bring in tighter regulations, such as a minimum age and licence requirement.

The tragic crash has sparked renewed safety warnings about the dangers of illegal e-bikes and scooters. (Nine)

“A young person has lost his life, not knowing the consequences of his actions, on e-bikes that are not toys and we see too often people on e-bikes without helmets, at speed, flouting the law,” Police Minister Anthony Carbines said.

“In the end the laws are there to be obeyed and when people break the law, other than being held accountable for it, the worst accountability can be that you lose your life.”

Max’s mates have vowed to give up the thrill of illegal e-bike riding.

“I get it, it’s fun, I used to love doing it, but I’m done with it now. l lost a mate to it,” Nogarotco said.