Craftsman mower sounds like a fire cracker

[maseman__46]

Howdy, I'm new here so don't kill me please.
I do an engine repair service out of my garage, and i'm having some difficulties with a mower. It is a Briggs and Stratton 14.5 ohv gold series engine.
When you turn the choke on and crank it, after a few seconds. You get a nice loud crack resembling a fire cracker. It is only with the choke on tho. It has spark, fuel and compression. I have adjusted the valves as per a million youtube videos. I am at a total loss here. Help would be greatly appreciated. Thanks!

 

[motoman]

maseman, Please tell us more like does it start, does it kick back? Is timing off due to blade shearing key on flywheel? Pros will respond,

 

[maseman__46]

Well, its an electric start only. And I'm not sure how I would check the timing on this thing since it won't run. I will look that up. Anything else you need?

 

[motoman]

I started to tell you how to find TDC and check against spark position, but that may be more work than pulling the flywheel. Do you have a puller, a manual?