John deer trs 21 snowblower keeps clogging up?

Follow the spark plug wire. It comes out from the coil. It's on the flywheel side of the engine. Bolts and parts will/may have to be removed to get to the coil.
Why do you need to know where the coil is ?

Contact your local John Deere dealer. He can look it up for you. Will need the model and serial number. (Possibly engine make as well).

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You tractor may have a switch under the seat that has failed. Many tractors have this as a safty feature to keep the tractor from moving if the operator is not seated.

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If you remove the air filter, you can see the actual choke plate.

50:1

yes 2 solutions. the sheer pins have got broken down on that auger that wont spin, they go through the middle bar. easy fix. about 2 dollar.

The other thing is. The drive belt located directly in the middle of the machine has a plastic cover over it has slipped off or is broken.

THis is a little more tricky as you split the machine taking off the collection cage usually to fix. I charge 89 dollars in my shop to do these.

Its not hard if you pay attention to where you need to take off the parts.