ORIGINAL: blw
Maybe put in a new glow plug and see if it cranks. Also, be sure you have it set rich enough. If the new glow plug doesn't get it going I would richen the low speed more. I'm not sure if you have already done these things yet so just suggesting here........
I was thinking the same thing. If the plug is hot and the fuel is good--it's too lean on the low end needle.
Thats a red flag for me. Anytime a new engine won't start, I start looking to see if the low speed needle is too lean.
Close the throttle.
Run the high speed needle all the way in.
Now back it out 3 or 4 turns.
Now run the low speed needle all the way in. Back it out 3 turns.
Try to start it at idle settings. If it won't start--back the low speed needle out 1 full turn. Try again. If it still won't start--back the low speed needle out another turn. You might back the high speed needle out another turn if it still won't start.
If you have the plug lit--and you have air--then all your missing is the fuel. It won't draw fuel if it's too lean, so you gotta open the needles to let it draw fuel.
You hooked the muffler up to the tank and left the bottom nipple on the crankcase alone--right? That bottom nipple on the crankcase is a vent--leave it open--it's not meant to pressurize the tank.