Not quite sure what you mean here.
The sprocket assembly from outside in is this: Sprocket, rubber, spokes, rubber, metal plates, all held together by the nine bolts. The sprocket MUST be centered on the rear hub. It should not have any up-down or side to side wobble. It must spin true. With the wheel mounted in the bike, no chain, spin the wheel and look for any wobbling.
The engine driven sprocket should spin as true as the pedal side sprocket/cassette/freewheel. If it doesn't, the chain will not track and come off.
Sight down the chain path from the rear looking forward to the engine. Is it straight? It should be.
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