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The Pull Cord snaps back when I try to start it.

Usually this is caused when you don't have any blades attached to the shaft.

Or could be a partially crimped flywheel key throwing off the timing
causing kick back. Noticeable after you hit something like a root etc.
It’ll run but pull the skin off your fingers when it kicks trying to start it.

Disconnect the spark plug wire and see if the issue goes away. If it does then like DaveTN says, it could be the flywheel key. If the problem is still present, check the blade for looseness.

VegetiveSteam said:

Disconnect the spark plug wire and see if the issue goes away. If it does then like DaveTN says, it could be the flywheel key. If the problem is still present, check the blade for looseness.

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That’s right, good point. That blade acts like a second flywheel to help smooth out the rotations.

Thanks to all for the advice