I have rebuilt my carbs, synced and color tuned them. If I let the bike sit for a few days it will give me a pop as the starter is hit, but then nothing, will not start at all. I have checked that there is fuel in the tank, yes it is fresh fuel. Fuel is in the bowls. Choke is on. When I pull a plug it is dry, telling me there isn't any fuel in the cylinders. My question is, does the idle mixture have anything to do with the fuel enrichment circuit ? SO if my carbs are a bit lean at idle will that effect fuel flow with the enrichment on? I do have another set of carbs and they never do this at all, they will start within 5 seconds all the way down to 20 degrees. So I know it isn't plugs, or the ignition system causing the problem.