to start off with, my engine is a Kohler courage 19 hp (model sv590). one day I mowed my grass and it ran fine. the next day when I went to move the mower, I started it and it sounded like it was under a heavy load (It was just sitting there). out of fear of damage, I shut it off to check the oil which was full. I tried to start it back up and it just turned once and stopped like it was stuck. i tried to turn it by hand and it was stuck but finally moved but it keeps stopping at this one point. after trying several things here is what i figured out:
I set the engine to right before the "stuck" position and removed the spark plug. i proceeded to turn the engine as I covered the hole with my finger and it sucked my finger in.
i replaced the spark plug and covered the intake and turned the engine- nothing
I removed the valve cover and turned the engine- both valves appear to function properly.
the engine is not pulling in any air through the intake which is creating a vacuum in the engine causing it to resist turning.
I am not sure where to go from here. please help