Re: first build won't start (yet)
Let me ask you two questions.
1. You said you had fuel in the line and in the carb. did you check to see if the plug is wet. If the plug is wet after you attempt to start it. Then see question 2.
2. Did you seal the carburetor intake. If not you might have an air leak which was the most common problem when I was messin with these kits a couple of years ago.
After those two suggestions I'm lost sorry if they don't help.
My posts have entertainment value only. A bike ain't yours till it has your blood on it. Then it owns you.