I just had to go pick up our 1988 JD Walkbehind mower because it either won't start or takes 15-20 pulls to get started after it has been used for a while. It has a Kawasaki FB460V motor. This thing has been nothing but a problem since I started here two years ago. I clean the carb at the beginning of every season, all the fuel lines look good. Unless there is something in the tank clogging the outlet or filter, I am leaning toward a carb problem.