RE: K&B .65 Sportster (yup, more from me)
I pulled the top of the engine apart - inside of combustion chamber is relatively clean but has some castor film on it. Darker brown in color both cylinder head and top of piston. No pitting in the head or the piston. Piston has shiny wear spots in the normal places - top and bottom of piston. The conrod has a little play side to side but nothing up and down. Looks pretty good inside.. I think I'll pull the carb apart again and make sure there isn't anything else clogging something. It literally will run WOT for a few seconds and then just quit. Glow plug is clean and new still, not melted or anything. I'm just not sure....