have you checked all of your wiring connections?
did you use the kit supplied push together wire connectors?
if so, those connectors are junk and they will break and vibrate loose. I would suggest soldering all wire connections and get rid of those connectors (if you haven't done that already).
another thing is that if you have anything hooked to the white wire (like a headlight) disconnect it and try to start the motor. also check to make sure that none of your wires have rubbed through the insulation and have bare wire touching the frame or anything else.
is there spark at the spark plug?
is there gas flowing into the carb?
if you have spark, spray a small amount of starting fluid into the throat of the carb and try to start it.
if it fires, then you have a fuel delivery issue.
check to make sure that your float is not stuck in the up position keeping the needle and seat closed. this will not allow any fuel to get into the float bowl.