Not Ranked
Since you seem to have confirmed everything is there, spark, fuel ect, my guess is it has jumped time for some reason. I have had a couple engines do this over the years and a couple teeth off, and they do exactly what your's is doing. Pull the number 1 plug and roll the motor over untill you know your at top dead on the compression stroke (it will try to blow your thumb off the plug hole) take a small wooden dowel that will fit in the spark plug hole, at least 8" long so you don't loose it into the cylinder, and with a socket on the damper bolt, bring the piston up to exactly top dead (the dowel will stop moving up and start back down) Check to see where your timing pointer is. My guess is it's going to be way off from 0 on the timing marks.
Now the question is.........WHY? I doubt your engine has very many hours on it.
Ray
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