Echo Bear-Cat Trimmer will not start

[MrWobbly]

In re. Echo Bear-Cat Trimmer with a Briggs & Stratton 725EXi engine.

Some details: The machine had been running.
The machine fell from a ramp while unloading. Wheel cracked but no visible dents in mechanism or engine.
My task was to replace red rubber primer bulb.
That failed to remedy the starting problem.
Upon further investigation I found indications of problems and ended up cleaning fuel tank, replacing carburetor.
Still no start. Compression is 30 PSI + Cylinder walls only slightly worn, no "play" at piston. Valves look in order
and operate properly.
While spinning engine with drill, the coil is firing, the spark plug gives nice blue spark.
I use 91 octane, no corn gas. The engine will not "fire", even with ether applications.
The engine has a built-in compression release system, but I know nothing about it. Could the fall have caused it to
leave a valve situation that prevents good compression?
The requested job is done, and the spark plug "fires", but the engine will not Start.
I have tried putting gasoline into the cylinder, and also ether. I spin the engine with a
drill, and there is no indication of ignition, even with the excellent spark.

What else should I try?

 

[sgkent]

spray some Berryman's B12 into the air cleaner and see if it runs for a second or two. If yes you have a carb problem. Or you can pull the spark plug and put in a 1/8 teaspoon of gasoline and try it.

 

[MrWobbly]

spray some Berryman's B12 into the air cleaner and see if it runs for a second or two. If yes you have a carb problem. Or you can pull the spark plug and put in a 1/8 teaspoon of gasoline and try it.

Thank you. I failed to mention that I had tried such in my first explanation.