A motorcyclist has claimed police were deliberately targeting him when they pulled him over and fined him for a 'loose' chin strap.

Julian Collis, a rope access technician with safety qualifications from Perth, told police he loosened the strap to converse with them, but they still issued him a $550 fine and four demerit points, ABC News reported.

'It seemed like he was looking for something to get me on. His colleague that was standing there with him pointed out to him that my chin strap didn't seem to be adjusted correctly,' the father-of-three said.

Julian Collis (pictured with son, Zander, 2) claimed police were deliberately targeting him when they pulled him over and fined him for a 'loose' chin strap on his helmet

'They were being quite forward. 'I said this is ridiculous, and they said, "Well we'll see you in court".'

Mr Collis said he thought he was being pulled over because he was speeding, and was shocked when police told him that wasn't why he was stopped.

'I go, "was I speeding?" And they said, "no". He didn't give me a fine in regards to the noise of my motorcycle but he had a thorough look over my motorcycle.'

He was through Malaga, north of the city, when he was pulled over and said he remained calm and polite throughout the exchange.

The father-of-three couldn't believe he was fined $500 and docked four demerit points (fine pictured)

Mr Collis insisted the strap was fastened tight while he was riding and thought maybe the police thought his buckle was undone.

The father said he couldn't afford to pay the fine and had written to police informing them of his intention not to pay it.

A WA police spokesman revealed the case would be reviewed by a person independent of the infringing officers' business unit.

Mr Collis was hesitant to let the situation 'boil over' to a point he would face a fine for not paying the original infringement.