A tight valve adjustment can cause hard starting.
I have seen vehicles parked and not start later. Usually, it has been happening for a while... hard to start in the morning, but once started, will start all day.
If you are squirting gas directly in the cylinder, through the spark plug hole, you might be flooding it.
Might want to try a new plug.
Odd that it has spark, compression (??), and fuel without starting.
Oscar