Re: HELP: Stripped screws and seized engine
I'm going to agree with Tom on this one because all the symptoms you mentioned point to the chain being bound up under the clutch actuator cover, try rolling it backward and it should un stick. It might take a good jolt to un stick it tho.
For the stripped screw heads, if you can drill the heads off all 3 of them then slip the cover off, the screws should come right out by hand or a small set of vise grips, there's no reason to try and save these screws as they can be replaced with allen screws nice and cheap. Of course, if you can successfully un jam the chain without pulling that cover then you can replace the stripped screws at a later time.