I have a Poulan Pro Blower Model #: PBV200.

It wouldn't turn over, so tested for spark, seems to have a powerful spark, then tested fuel filter and air filter, seemed clean. Being all it takes for these to run is air, fuel and fire. I tested the gas and gas lines, even replaced with fresh fuel, since it did sit through the season.

Fuel lines looked good and clean, questionable carb, looked like the diaphragm has rotted away, so replaced the carb, cleaned out muffler since it at first felt like I was getting a little resistance. There was a mud dabbers nest, but it's clean now.

Tested, still won't turn over, poured a little fuel on air filter, still nothing. Used starter fluid again with the muffler off, got it to back fire a few times, and sounded like it almost turned over, but then shut off.

Upon inspecting the flywheel it all looks like it isn't bent or anything. What else could it be that is causing it not to turn over? I am dumbfounded right now!

Initial carb setting?

Check you compression , you will find real hi or real low.
That unit has a one ring piston, the ring is probably stuck,if you take the muffler off and look in and push on the ring ,there will be no movement there are two ways to fiw it one take apart and put a ring in it,the other is throw away and buy a new blower.

I haven't adjusted either adjustment as far as carb settings go, do to them being so touchy. Left factory settings. I will check the ring and see. Could it possibly be a bent shaft? It seems to move fluidly and have compression?

Did just notice cylinder had some how come loose from the shaft housing on one side, which potentially could be where the loss in compression is, after taking the piston and ring out, the ring was cracked. Obviously one end is supposed to be that way, however it was cracked in half.

Make sure there's no grooves in the cylinder walls.
When you put the new ring on make sure the notch goes in the open end of ring.
Sounds like your on your way.
LUCK