My JD L100 tractor 2 months ago refused to crank. I tried many ways to get it cranked and the battery died. After I carefully checked under hood, I found park switch was off. I replaced it and also disable seat safety switch. The electric problem was solved. Starter starts spinning and flywheel rotate accordingly. But the engine does not want to fire up. So far I tried:

1) cleaned carburetor
2) adjusted valves according to manual
3) tested fuel solenoid and its working
4) tested spark plug and it shows blue sparks
5) finger felt compression at spark plug hole
6) sprayed carburetor cleaner into carburetor and started for a few seconds and died

Since my battery died, I have to use jump cables and charge the tractor from my car's battery.

I also tried to start it with air filter off and gas tank cap off

It just does not want to start. I notice that when I tried to crank the engine, the engine has this noise I never heard before. Even with it, I still felt compression at spark plug hole.

I ran out of ideas. So far, I can tell, sparks are there, compression is there. Maybe its fuel. But I cleaned carburetor well. I can also heard clicking sound from fuel solenoid when I turn on ignition, which tells me its open.

I appreciate any suggestion or idea

Cliff