I have a question. Does this mower require battery power to run the coils.
If It does I would check to see if the power supplying the coils has a resistance build up. I have a craftsman GT 6000 land tractor and when the main fuse blows it will kill the mower.
You
Sure that it's compression or is something broken in the engine.
I know some of these engines can have a broken camshaft pressure release. But in that case it's hard to turn over but you can find still turn the engine over with a socket rinch.
Are you sure something is not in the cylinder...
Have you checked if the carburetor to see if it has a fuel solenoid on the bottom of the float bowl. They go bad and sometimes they stick closed. I would remove the carburetor and clean it good and check the solenoid to see if it's free to move. If it's free make sure it's working by applying...
Just wondering if you have a vacuum leak. My mower is doing the same thing. I've already had one vacuum leak. I'm just wondering if your engine is a twen cylinder. You know a vacuum leak would memic the same symptoms as a choke not being fully closed. My engine is a 20 hp onan.
I have seen...
I would flush out the gas tank. I would check my gas can also.
I would never trust what comes out of a gas station pump. Pore your fuel into a glass container first before you put it into your machines. I had to replace my wifes gas tank because of trash and water. A cars fuel tank has a baffle...
A fuel filter can be difficult to remove sometimes.
But don't use heat. You can pry with a screwdriver in between the filter and the hose. I've found if you hold the hose and twist the filter that sometimes works. And if you have enough fuel line I would just cut the lines off from the filter...
Mounting bolt torque to be minimum of:
3/8"-24 UNF use Grade 8 bolt torqued to 40/45 lb.-ft. (Grade 5 bolt is unacceptable)
7/16"-20 UNF Grade 5 or 8 bolt torqued to 50-55 lb.-ft. (Grade 5 or 8 bolt is acceptable)
M 10 X 1.50 Class 10.9 torqued to 55-60 N-m.