Kawasaki FR730V, sputters, dies after mowing a while.

[Jreldr01]

I have a Gravely ZT HD 60, with Kawasaki FR730V engine. Mower will start up fine, I can start mowing, mows fine, then about 30 minutes or so in will sputter and die out on me. I can pull the choke and get it to come back momentarily but push choke back in and it will die. Will also clear up if I disengage the blades. Have replaced, fuel lines, fuel filter, carb, spark plugs and coils. Any advise or thoughts are appreciated. Thanks.

 

[bertsmobile1]

Bad tank vent or debris in the fuel tank.
To confirm, when it starts to splutter loosen the fuel cap problem goes away, bad venting
If not repeat the above and when it start to splutter take the fuel line off and blow back through the tank.
Problem goes away = floating debris in the tank.