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6.5 hp Briggs & Stratton motor (123K02 0631-E1) on Poulan pushmower

Was working well as usual, and shut it off for a moment (to talk with someone) and when I pulled the rope to start, it threw a backfire but wouldn’t start. Pulled rope again and another backfire . . and again and again . .but will not start.
Any suggestions?

Check flywheel key for shear or partial shearing.

Walt Conner

Back to basics...
Try another KNOWN good plug BEFORE tearing things apart.

Thank you all for replies.

"Check flywheel key for shear or partial shearing."

I don't know how to go about this. any links for instruction?

"Try another KNOWN good plug BEFORE tearing things apart."

I also tried a new spark plug, and no change.:confused2:

ok so i found a video or 2 on youtube about flywheel key replacement. I'm gonna take my mower apart and see if i can sort this out & report back later.

ok I saw a video and it refreshed my old (and getting older) memory of when i had done this operation in the past.
Took it apart and pulled flywheel with a faucet handle remover and replaced sheared pin with an old one I had saved many years ago, has the tiny B&S logo in it. LOL.
Put it together and started on 1st pull.