Six goals from Keegan Knott has helped West Perth sink Peel Thunder by 28-points at David Grays Arena.
Blair Bell booted three goals for the home side but it wasn't enough at the Falcons recorded a 12.8.80 to 7.10.52 victory.
Peel led by 10-points at quarter time before West Perth piled on six goals to one in the second quarter to open up a 21-point lead at the main break.
A goalless third quarter from the Thunder open the game wide up and despite kicking three goals to one in the last couldn't erase the defecit.
The Thunder remain in fourth spot on the WAFL ladder but face Subiaco next week at Leederville Oval.