backfires on pull

[TrojanEnzo]

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?

 

[Tinkerer200]

Check flywheel key for shear or partial shearing.

Walt Conner

 

[Russ2251]

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

 

[TrojanEnzo]

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:

 

[TrojanEnzo]

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.

 

[TrojanEnzo]

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.