Did you have cooling while doing this? You can overheat the motor and kill it that way. Does the motor seem to feel the same when you pull it over or has it tighten up? Easy to pull the head and check to see if you over heated it. 4 bolts and off she comes. When putting it back together make sure to get the ring lined up with the notch in piston. It will be on the intake side. If you have to force the piston into the head, you are doing it wrong.
I just read your earlier post.
To check plug, remove from head. Put plug wire back on. Take plug and lay it on top of the head so the fat metal part is touching the plug hole area. You want it to be able to see the end of the plug while you pull it over like you are starting it. Helps to be in a darker space. You will be able to see the spark jump the gap. If you do, plug should be good. Keep your finger away from the end of plug. Kind of shocking if you dont.
It is very easy to flood carb. When I am usually starting a boat, I put my finger in the carb hole and pull it over top dead center once. Check finger. If it is wet, then you can start it by just pulling the starter. If not repeat it again with one rotation until you see fuel on your finger.
Good carb settings for 1048 (300PUM standard carb) are 1 on high needle and 1.5 on the low needle. If you look at carb there is a H and L embossed on the carb body.
Dont take this the wrong way. You are running a mixed fuel I assume. It is not just pump gas. You have to add 8oz or so to fuel.
Hope this helps.
Mike