The Tigers led for the whole match after an early major from Tom Ledger in an 8.6 (54) to 6.12 (48) victory at Claremont Showground.
Frustratingly for the Falcons, who will finish in their lowest ladder position in a decade, they have lost five matches by just two goals or less in 2014.
And it’s been inaccuracy that’s cost the reigning premiers in the majority of those games, having had more scoring shots in four of them.
On Saturday, West Perth had kicked a crooked 3.9 (27) up to three-quarter time before straightening up in the final term.
Claremont led by as much as 28 points midway through the clash, but the Falcons kicked four goals to one in the second half to give the home side a late scare.
Coach Bill Monaghan exposed another youngster to WAFL league footy with 19-year-old Corey Chalmers taking nine possessions and kicking a goal in his first match.
Midfielder Aaron Black had a match-high 36 disposals, while Seva Martin and Max Alexander kicked two goals each.
The Falcons play their final game of the season against Perth at Lathlain Park on Saturday.