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This all started with a fuel nipple cracking from the carb. I've epoxyed that back together but I can't get it to crank now. I thought the carb may have gotten gummed up from drying out so I've tried both spraying carb cleaner and fuel down the plug hole (to bypass the carb) but it still won't crank or come close. I have also grounded the plug and do see a blue spark though I wouldn't know if it was weak or something along those lines - it is blue though. It has compression - I can feel with my thumb over the hole. If I dump fuel or carb cleaner down the hole and it sparks, what else would stop it from firing up?

Thanks for any tips.

On a blue smoke either your thumb needs to be recalibrated or the timing key inside the flywheel has broken so it is out of time.

Two things to add to what Bert said:

1. Muffler could be clogged
2. Spark plug could be bad even though it's sparking

If the unit was running when the nipple broke, then the chances are you got epoxy on the inside of the nipple and it is either fully or even partially blocking fuel flow.
If it has sat for awhile, the diaphragms may be dried up inside the carburetor.