SAN FRANCISCO — Strong-armed fill-in Colin Kaepernick made all the right throws, looking every bit a capable NFL No. 1 quarterback.

Kaepernick passed for 243 yards and two touchdowns in his first career start in place of the injured Alex Smith, and the San Francisco 49ers whipped the Chicago Bears 32-7 on Monday night in a highly touted NFC showdown that hardly lived up to the hype.

Kaepernick threw touchdown passes to Vernon Davis and Michael Crabtree, and Kendall Hunter ran for a 14-yard score as San Francisco (7-2-1) jumped out to a big lead by scoring on each of its first four possessions – with Aldon Smith wreaking havoc on the other side of the ball with 5 1/2 sacks.

“I really wasn’t too nervous,” Kaepernick said. “I’ve had a lot of time in this offense. My teammates were really supportive.”

Jason Campbell, the other quarterback in this matchup of backups for two division leaders, threw a 13-yard touchdown pass to Brandon Marshall in the third quarter but was sacked five times and threw two interceptions in his first start since October 2011 for Oakland.

He faced fierce pressure all night, on the field for the Bears (7-3) as starter Jay Cutler recovers from a concussion suffered eight days earlier – just like Smith.

After Kaepernick’s stellar night on the big stage, there’s certain to be chatter of a quarterback controversy for the NFC West-leading Niners.

Aldon Smith took over the NFL sacks lead with 15, passing Denver’s Von Miller with 13, with the second-best total in franchise history behind Fred Dean’s six-sack day on Nov. 13, 1983, against New Orleans. Tarell Brown and Dashon Goldson each had an interception for San Francisco’s stingy defense, which shut down Campbell, Matt Forte and Co. three years after the teams last met in a 10-6 49ers home win.

“It definitely wasn’t our best effort, by no means,” Campbell said.

Kaepernick, Aldon Smith and Hunter sure made general manager Trent Baalke look good for his selections from the 2011 draft class.

And reigning NFL Coach of the Year Jim Harbaugh earned a key victory four days after his own health issue. The 48-year-old Harbaugh underwent a minor procedure for an irregular heartbeat Thursday.

The 49ers added a safety in the fourth quarter that was scored after review. With 9:24 left, former San Francisco offensive lineman Chilo Rachal was called for intentional grounding out of the end zone, but Harbaugh challenged and earned the safety after review showed Rachal was down in the end zone.

The soft-spoken, stone-faced Kaepernick went 16 for 23 with a 133.1 passer rating. He completed 12 of his first 14 passes with a 57-yard strike to Kyle Williams that set up Davis’ 3-yard TD on the next play – and he already had amassed 126 yards passing by the end of the first quarter. The 49ers led 17-0 on Hunter’s early TD run in the second, quickly topping the 14.8 points the Bears were allowing per game.

Kaepernick threw for 184 yards in the first half alone – an impressive outing for the second-year pro selected in last year’s second round out of Nevada.

“I think after the first drive I felt really comfortable with what they were doing and what we had in our game plan,” he said.

Frank Gore ran for 78 yards and David Akers kicked field goals of 32, 37 and 32 yards for the 49ers, eager to defend their home field a week after settling for a frustrating 24-24 tie against the division rival St. Louis Rams.

They outgained Chicago 249-35 in a lopsided first half.

Davis got his prime-time moment just how he loves it. Eager to get more involved in the offense down the stretch this season, the tight end had a team-best six catches for 83 yards.

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