have a bob-cat with 20hp engine about 1300 hrs. when cold runs great after about 20 minutes starts bogging down like it is not getting gas. so this is what I have done so far replaced fuel pump all hoses and filter. same problem after it gets hot can let it cool down and same thing happens. last thing I did was pull fuel connecter off top of tank slid new gas hose into tank left about 4 inches out and put new fuel filter to that and put new fuel line to new fuel pump. guess what had same problem. Is there something in carb that could be causing my problem. forgot engine is a Kawasaki fx600v.