the pink tube is the overflow pipe,it means the carb is getting too much fuel and has a problem with either the float or float needle ,the float may have a split in it which will make it sink instead of float on top of the petrol or the flaot needle may not be seating in the needle seat properly and letting petrol past even though it is being pushed up by the float.you will need to remove the float bowl on the bottom of the carb and take the float off check there is no fuel insde it and then clean it out taking care not to bend or damage any parts,make sure the needle seat is free from and water or debris as this will cause the problem,i am a bike mchanic by trade so i know this will be where the problem lies ok,hop tht has helped you laura ,adam
adam bike doctor
August 2006