Coffin Cheaters and the South-Australian based Finks were involved.

Police in Perth are yet to lay charges over an argument between two bikie gangs which left three men in hospital with bullet and stab wounds.

All of the men have serious head injuries after a fight between the two gangs at the Kwinana Motorplex yesterday afternoon.

One of the men received a gun shot wound and another multiple stab wounds.

Police will not say if Coffin Cheaters and the South-Australian based Finks were involved.

Police have previously expressed concern about the two gangs after Coffin Cheater Troy Mercanti was recruited by the Finks in 2008 to help set up a Western Australian chapter.

The Motorplex denies any knowledge of an incident involving weapons.

The three men are refusing to cooperate with police and no charges have been laid.