Too Much Compression?

[milliemar]

#1 Make sure your battery/engine ground wire is clean and tight. #2 Intake valve needs adjusting.

 

[CWatters]

I had same issue on a B&S. Definitely check the valve clearance is spot on.
Apparently the decompressor only opens the valves a tiny bit so if the valve clearance is slightly out they don't open and the starter can't turn the motor over. Adjusting mine totally fixed the problem.

 

[dbelcher1950]

Before tearing into your engine, check the valve clearances. I have seen improperly adjusted valves cause the condition you described.

 

[LarsMunk]

Hi,
Have you checked if gasoline has found its way through the carb to the cylinder and into your oil?

Had the same problems because of that.