amc49
CB750 Guru
If the ethanol in fuel answer was yes then the idle jet hole size is such that they tend to clog when the ethanol makes the fuel dry up faster. Bike then won't idle, no fuel. Those holes are like .013" or so in size and they can still have fuel in them even if carb is drained, capillary action keeps them with a drop of fuel covering the opening. It then dries and clogs the hole.