Being 26 hp. I am thinking it is a twin cylinder engine.
Remove the valve covers. Crank the engine over and observe their operation.
Something like 3 years ago, Briggs decided to switch their engines to 'laminated' or built-up camshafts. The cam gear and the cam lobes are pressed onto a shaft. I have replaced many of these camshafts in their single cylinder engines and so far have seen two of their twin cylinder engines with a failed camshaft.
The single cylinder engines tend to break the compression release off and then they won't start. The starter can't crank against full engine compression.
On both the twin cylinder engines the cam gear broke apart and the valves were not moving.
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