Second CC107's suggestion. Pull the cam cover and you should be able to see the comp release mechanism. It would explain a lot since the rollover could have knocked the CR spring out of position.
Are you sure your S/G is working up to capacity? They can spin freely without a belt but then bog down under load. This can be anything from worn/gummy bearings/bushings to worn brushes, dirty commutator, loose/worn wires, etc.
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