When their league-leading scorers drew blank, the Portland Winterhawks still found more than enough firepower to dominate a division rival.
Chase De Leo contributed five assists for Portland, which built a 5-0 lead midway through the second period.
With two goals and four assists, Leier posted the first six-point game by a Winterhawk since Chad Wolkowski did it on Dec. 1, 2002.
Shaun MacPherson and Paul Bittner also scored for Portland (48-9-3).
Elsewhere in the WHL it was: Kootenay 5, Swift Current 2; Edmonton 6, Prince George 0; and Saskatoon 5, Brandon 1.
At Portland, Ore., Alessio Bertaggia, Adam Helewka and Mike Aviani were the goal scorers for Spokane (34-24-2), which has been outscored 14-3 over its past two games.
Leier scored twice in the first five minutes of the game to give Portland an early two-goal lead. MacPherson's long slapshot put the Winterhawks up 3-0 after one period.
Bjorkstrand, a 17-year-old rookie from Denmark, registered a hat trick in the second period as Portland took a 6-2 lead after 40 minutes. His fourth goal of the game came with 12:03 left in regulation to put Portland up 7-2.
Aviani's power-play goal in the third period brought the Chiefs a bit closer, but Bittner scored a late goal with the man advantage to round out the scoring.
Portland went 3 for 8 on the power play, while the Chiefs finished 2 for 5.
Ice 5, Broncos 2
At Swift Current, Sask., Jaedon Descheneau scored a hat trick to lift Kootenay (29-29-2) past the Broncos (28-26-6).
Oil Kings 6, Cougars 0
At Edmonton, Michael St. Croix had a goal and two assists against Prince George (18-34-8) to become the first player in Oil Kings (43-12-5) history to surpass 300 career points with 302.
Blades 5, Wheat Kings 1
At Saskatoon, the Blades (35-21-3) scored five unanswered goals to beat Brandon (21-35-5) for their 12th straight win.