RE: Dead Ninja .28
Nobodies suggested the easiest thing yet, Try a new glow plug.
It's quite normal to replace the conrod after break in, if you think the during that period he rod is under the most stress it will ever see, a lot of mnufacturers recommend replacing it after the first gallon anyway to avoid this very problem.
Also, what fuel are you running it on and have you shimmed it to accept this?