Scheifele gave the Jets a 1-0 lead at 6:43 of the first period on a power play, and Ehlers made it 2-0 at 15:03 with a shot from the right face-off dot.
"[Scheifele] had an outstanding game on both sides of the puck," Winnipeg coach Rick Bowness said. "Happy to see the goals go in, but it was just as important what he did at the end of the game defensively, in our zone, battling behind the net, winning that battle and getting it out. A solid, solid game from him."
Tkachuk cut it to 2-1 at 16:44, jamming in a rebound on the power play.
Namestnikov extended the lead to 3-1 with 53 seconds left in the first after Ehlers found him in front with a pass from the corner. It was Namestnikov's first goal with Winnipeg since being acquired from the San Jose Sharks on March 4.
"[Namestnikov's] a guy, he just knows where to go on the ice," Jets defenseman Dylan DeMelo said. "A smart player. Not the biggest guy but he goes right to the net front on that goal, and great patience."