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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!

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,

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?

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?