Sorry it is a HRR2168VYA on a self propelled 21" mower. Went home last night and pulled the pull rope assembly back off to see if it was froze up but it turns freely. Would this have anything to do with any of the safety devices that most of the new ones have that would do this same thing, most have told me that the safety devices let it turn but it just doesn't start. Is this the case? If the clutch for the blade stop was not working would it not allow the engine to turn if the blade was still engaged?