Kawasaki engine dies after running 20-30 minutes

Immediately check for spark after it dies. A failing ignition module will quit after it gets hot (about 10 minutes) then work again after it cools. Other causes could be a blocked tank vent; try to run till it starts to act up and loosen the fuel cap. See if it starts to run right again or if it does die it starts right back up. A sticking shut-off solenoid, sticking float needle or partially clogged fuel filter can also cause these symptoms. They let some fuel in but not enough and eventually the motor starves for fuel. then slowly the fuel fills back into the bowl and it will run again for awhile till it runs out of gas again.

To start ensure that is not a carb problem, and that the engine is not chocking because of incorrect carburetor settings. The carb should also taken apart and cleaned.

Try also running the engine without fuel tank cap, if engine runs fine replace the tank cap.

if carburetor, fuel filter, tank and fuel lines are ok it may be a faulty fuel pump failing. To test the fuel pump, insert a pressure gauge tool like this in the lines out from fuel pump.

Regards.

When it starts cutting out and you turn off the PTO, how long do you have to wait until it can be turned on again? It sounds as if your PTO is overheating and loading down the engine. Run the mower for about 10 minutes, shut it off, and carefully feel the PTO housing. Resume cutting and repeat after it starts cutting out.

Replacing it is not as simple as changing the spark plug, but does not require an advanced degree.

Check your exaust hose. Mine came loose inside the engine compartment and it caused the same problem. Would run great for a while, then just die or start sputtering like it was missing or the plugs were bad. After I let it sit for a while it would start up fine, run great for about 15 mins, then have the same problem.

Might be Coil Breaking down under heat. Not sure best way to diagnose other the cross your fingers and buy a new coil. Sounds like you did everything you could do Fuel -wise.

well its back to the fule flow,,,i thing the fule lines and carb are blocked up and needs a strip down and a good clean up of all the jets and flote bole this sounds like fule shortage,,,if the engine is only just turning and you try to put it in gear so the cutters start to turn it loads the engine up and it stops!
you say pulling the choke out get it going!!!!! then its short of fule ,,,right!

Mine did this too. THe semi-transparent fuel filter will look like no gas is in it if you have the problem I had. The gas cap on the tank has a tiny breather hole to keep it from coming under a vacuum as gas runs out. Push thru it with a toothpick to clear the hole. That's all it was. But I did have some black debris clogging the filter and had same symptom.

check fuel pump diaphram is not streched or hard, check fuel filter for blockage, or fuel tank cap might be not venting, if none work drain and clean out carby bowl.

I am going to suggest a tune of of the engine. Change the oil and oil filter. Check the air filter is clean and replace it if it isn't. A new spark plug.

Find the fuel air mixture screw and while the mower is running turn so mower almost stops then turn them back till the moter is running smoother.Give it some throtle to see & hear how it is running