A Perth man alleges he was assaulted with a "stun gun" in a Facebook Marketplace sale that turned into chaos in city's north-east.

Bevan claimed his son's e-scooter sale turned "sour" on Monday afternoon when he was handed fake cash.

Police allege a 28-year-old buyer tried to start the scooter and get away.

"I couldn't let him go away with that scooter," Bevan, 66, told 9News.

Security cameras captured three men arriving at his home in the Vines just after 3.30pm.

His 14-year-old was handed a bag of cash.

Bevan claimed when he told the would-be buyer "mate, this is fake money, we're not gonna take it", he claims the man immediately turned violent.

The father said they got into a scuffle and alleged the would-be buyer pulled out a stun gun, Tasering him on the hand and c

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