I connected a battery and turned the engine over. It spins nicely but will not start. With the spark plug wire off the plug, I see a very nice spark to the engine block, so I know it's getting a spark. I also know it's getting gas, but in fact, too much gas because the spark plug is getting soaked, and after cranking it with the battery/starter for awhile the engine would get very tight because of gasoline flooding. Pulling the spark plug made it turn easily again, but the plug was soaked.
I put a vice grips on the gas hose to stop the gas from flooding the engine. I still do not get even the slightest pop from the engine.
I put the spark plug on the end of the plug wire and can see a strong spark on the plug tip.
There is still some gas in the carburetor, and I know the spark is good. Why wont it start?
I have no idea why they had the head off, and the piston moves up and down properly, so do the valves, and the cylinder is smooth. I cleaned all the carbon off the head before I installed it. I can hear the compression, and since the gas flooding caused the engine to cease up, it's obvious there is compression. I dont have a compression tester but I can hear the compression.
Since there is a good spark, some gas, and compression, what the heck could cause it to not get at least a little pop? What else can I check? I have worked on many mowers in the years and never had one that wont at least make an attempt to pop.
This is a 4 cycle engine.
A few notes. I put in NEW gas. The oil is at proper level This has a bulb for cold starting I did NOT buy a new head gasket, but it was in good shape, and like I said, it has compression. I am trying to start it using an external battery charger, so it is spinning fast enough.
Any ideas? I have run out of things to try?????
The only thing I can think is that there is just too much gas still remaining in the cylinder, but I did turn it over quite a bit with the plug removed.