OK.

Just for grins, try this.

Screw the hi-speed needle all the way in GENTLY on the seat please and leave it there.

Remove the glow plug and turn the engine with the starter to blow out all of the fuel.

Replace the glow plug (leave the needle alone).

Turn the engine with the starter. If it continues to turn then you most definitely have a flooding problem.

If it stops, then you most likely have some other sort of problem UNLESS the carb hi-speed needle is not shutting off the fuel supply for some reason.

Hey, try anything that might give you a clue.

Dan