Tilux.....

Make sure your Glow Plug is Good. Use a New One if you are not sure. (You ARE using the correct Glow Plug, right?. I Think it should be a HOT one.)
Make sure that your Glow Plug is Tight, and that the Head Screws are tight. Header screws are not loose? Carb is not loose in the Block?
Make sure your Igniter is Fully Charged (charge it over night, to be sure).
LSN set at 4 1/2 turns out. HSN set at 2 1/2 turns out.

Prime your carburetor. (Remove the fuel line from the Exhaust and BLOW in the tube till you SEE a solid line of Fuel go to the carb. Put the line back on the exhaust.)
Use the Radio trim to INCREASE the idle setting a little bit. You want a high Idle for now, so that when it stars, it STAYS running.

Try Starting it with These Settings. Should fire up and run. (You will still have to TUNE it Though, after it starts.)