The Falcons trailed by as much as 42 in the third term but kicked the game�s last 12 goals, including 10.5 to one point from the Royals in the fourth quarter, to emerge victors, 17.16 (118) to 12.8 (80), at Arena Joondalup.
In promising signs for the hosts, who struggled to kick majors against Claremont the previous week, West Perth produced seven multiple goal scorers, with Aaron Black, Andrew Strijk, Michael Lourey, Matthew Johnson, Jay van Berlo, Aidan Lynch and Kody Manning each booting two goals to share top-scoring honours for the Falcons.
Midfielder Shane Nelson, while not rewarded with a goal, had a match-high 43 disposals and led the game in tackles (7).
Former West Perth star Mark Hutchings, itching for a call-up to a rejuvenated West Coast Eagles team, had 26 disposals, two shy of Alec Waterman and Steven Payne�s team-high 28 possessions.
Relegated Eagles ruckman Scott Lycett kicked three goals.
With the first third of the season completed, West Perth, which has leapt from seventh to third, has an opportunity to strengthen its top-five credentials against second-placed East Fremantle at Arena Joondalup on Saturday.
The Sharks have proven somewhat of a bogey team at West Perth�s home ground. Incredibly, it�s been nearly six years since they have lost in Joondalup, last falling to the Falcons on August 1, 2009.