T28ron, I would guess the reason it would not start again after it ran the first time is because everything heated up and expanded, and got tight inside the cylinder. Like I said before, these big moki engines require a lot of breakin time. Did you add more oil to your fuel before starting it this time? I can't stress enough the need for you to make sure that the engine has been properly broken in BEFORE you start trying to lean out the mixture and getting the engine to run smoothly. Until the engine is broken in properly you will have problems getting it to run consistantly. Just slow down and do the bench mounted breakin procedure, (if you don't have the procedure, I will send you one) and I think you will see that your engine will start to run a whole lot more consistantly.
good luck.