Poulan Pro blower BVM200vs won't start. No spark, changed coil, now I have spark, gas flow good. Tried grounding kill switch to engine & tried removing switch. Do magnets need 2 B indexed to shaft?

Well you certainly have tried a great deal of things, your compression is fairly low, however I would expect it to fire all be it not run too well, initially I would suspect a couple of things, a massive air leak i.e. crankshaft seal leaking or has fallen out, or the flywheel key in the flywheel has sheared knocking the ignition timing way out.

https://www.manualslib.com/manual/133944/Poulan-Pro-Bvm200vs.html?page=13#manual

They generally ground through one of the screws that hold the cover(s) on to the engine itself.

remove the wires that go to the kill switch and try it if still no spark the coil is bad

Check that the coil/magneto gap is set to .020"

If you have a spark, it's not your ignition or flywheel because they both work together to make the spark.
Give a starter fluid squirt into the sparkplug hole (instead of thru the carb), screw in the sparkplug and give it a try.
Check your muffler to see if it's stopped up. You can just remove it for the initial check when trying to start w/starter fluid.

how to replace cord in apoulan pro gas blower

i have a polan bvm200vs. that wont starits got the main 3 gas spark and compresion i even change the gas in it and still noyhing

Ok. Good job on doing what you could, right off! The simplest things are the most overlooked, and the most unforgiving.

So, you know your plug is wet, so you got some fuel flow.

Now let's figure out the plug no-fire problem. (This is under the assumption you haven't beat on this blower with a sledge-hammer at one point. The whole "key-way" is fried thing.)

1. Grab ahold of that plug THEN crank away. One time will tell you yes or no on spark. No, I am not joking, and yes, it is better than staring at the end of a plug and wondering if your eyes are bad.
In fact, better than a cup of coffee......in a bad way.

2. Check your kill switch. It is either: Grounding, or Open (open like it should be, UNTIL you push it, click it, or slide it, whatever you got). One CHEAP and fast way: Unhook the kill switch.
Then crank away. No spark? Not the kill switch then!

3. Check your spark plug GROUND. Let's say you got some shocking results from grabbing onto that bad boy. NOW check where the plug meets the cylinder head when she is screwed down in there. Believe it or not.....if it is funky, she won't ground right!
Hence, no worky.

4. You got no spark at all.....STILL. Let's look over your Spark Plug WIRE. Is she wore through? Is SHE grounding out? Has she heat failed? Then do #5.

5. STILL no spark. Let's check the last 2 things......
Rotor Magnets, and Magneto (ignition coil).
IF you have a volt/multi-meter, hook her up to the plug wire. No juice = Bad Magneto, or Bad Plug Wire. SOME juice = Good Magneto, but Bad Plug Wire (in some mowers/weedeaters, etc., remember that the Magneto is where the kill switch hooks too.
See if it is somehow grounding you out, by being loose but still touching the cylinder, etc.)

6. Failing Magneto. This can happen, and it does. You get SOME juice, just not ENOUGH juice. 2-Strokes make a lot of heat, even Magneto's give up the ghost after a while, sometimes. In this case, find a replacement!

Alright, remember that 2-Stroke motors are meant to do 2 things:
Break down, then Frustrate you.

So, here we go: (Electrical)

Rotor Magnets, Magneto (ignition coil), Spark Plug Wire, Spark Plug, Spark Plug Ground (Cylinder Head).

In that order!

Check your "fire" from the Magneto:

1. Check your Kill Switch. In other words, leave everything normal, and unhook it. Did she start? Kill Switch it is! Kill Switch/Wire comes from the Magneto (single wire/ground) to the Switch itself. So check that wire AT the Magneto (Is it loose and grounding out? Is the Kill Switch grounding you out where it is, because of crud, junk, or because it is touching the block when it is not supposed to?)

2. Check your Spark Plug Wire. Easy, unook it from the plug, stick your finger in, give it a crank (non-MultiMeter way). Did you get shocked? Then it ain't your Plug Wire and Magneto!

With a Multi-/Volt Meter, simply hook her up, and check for juice WHEN you pull the rope. If you got juice, it ain't your Plug Wire or Magneto!

Checking Spark the "normal" way: Grab the Plug with a pair of insulated pliers, hold the plug end against the cylinder head, and pull your rope. Any Spark? What color?

3. STILL no fire. It leaves: Magneto and Plug Wire.
Luckily, they are both in the same place! Tear your blower down, and check to see if the Magneto has slipped out of place (gap is WAY out), or if the Plug Wire has worn to the point it is grounding you out. While you are there, check your Kill Switch wire, to see if she is grounding you out then and there.

4. STILL no fire. That means: Magneto Failing, or Magneto JUNK.
Buy another one, replace it! (Or steal one from another junk Blower/Weedeater. These things are fairly standard, and easy!)
Or, Bad Plug Wire. Meaning she has failed out on you.
Wait......that means: Replace your Magneto! Lucky the things are built together right?