M-ZT 52 Stops running when hot!

Sounds like Coil going bad. Insulation breaking down with Heat. It's happened to me a couple of times with Briggs engines, they would last about 1/2 hour before quitting. New coil is the fix.
 
Gord Baker said:
Remove Fuel tank Cap and fuel line at filter. Blow back the line carefully with minimum pressure. Do this outside, off the driveway and don't be looking in the tank while you do it. Then blow the other direction using low pressure. If fuel flows OK, continue to removing Float bowl and be sure fuel flows with float raised. Remove carb jets and emulsion tube and clean all tiny orifices carefully. Rinse with Brake cleaner. Use eye protection.
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So here is what I have done so far, I installed a new (second one) fuel pump, this time a Mikuni and took off the chinese knock off as I read sometimes these are just not reliable, new Kawasaki fuel filter, pulled the fuel line out of the tank and it was clean, new air filter, checked for grass under the engine shroud. I started it up and I had a much stronger flow of gas out of the hose at the carb. I figured I got it fixed, WRONG, about 3/4 my lawn done and it sputtered out and quit running. I let it sit about 15 minutes, it started and ran good again to finish my lawn. I am going to put new plugs in it this week and if that don't fix it, maybe one or both coils may get weak when they get hot? Its really got me scratching my head! About 250 hours on it and it ran like a beast and now letting me down...
 
It sounds like you possibly have a blob of foreign contamination floating around in the tank and it is blocking the fuel pick up line at random. Old fuel cans are the worst for contamination buildup and possibly bugs getting in them.

Also, from what I can tell in a part diagram on Parts tree there is a vent check valve in the top of the tank for vapor emissions control. The valve may have failed and is creating a fuel cavitation (vacuum) in the tank. Try running until it acts up and then loosen the fuel cap and see if you can hear air sucking in as you loosen the cap.

Another possibility is if this has a special shaped pickup tube that is shaped to fit into the tank contour a certain way, it may be out of position and not picking up fuel when the fuel gets lower.

A couple of weeks ago, I had a John Deere 757 with a special shaped fuel tank tube that fit through the tank line grommet. It had to be "clocked" in the correct direction to work properly.
 
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littlegman said:
I have a Husqvarna M-ZT52 with the Kawasaki FS651V motor. I have had it about 5 years and has served me well, about a month ago while mowing my 2 acre lot, it would quit running about 1/2 way threw and would not start until it sat there about an hour. It looked like the fuel filter was empty so I figured the fuel pump was going. so I installed new fuel pump and filter but is still doing the same thing. I know its hot here in Tennessee but no different than other year but never had this problem before, any suggestions ?
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littlegman said:
So here is what I have done so far, I installed a new (second one) fuel pump, this time a Mikuni and took off the chinese knock off as I read sometimes these are just not reliable, new Kawasaki fuel filter, pulled the fuel line out of the tank and it was clean, new air filter, checked for grass under the engine shroud. I started it up and I had a much stronger flow of gas out of the hose at the carb. I figured I got it fixed, WRONG, about 3/4 my lawn done and it sputtered out and quit running. I let it sit about 15 minutes, it started and ran good again to finish my lawn. I am going to put new plugs in it this week and if that don't fix it, maybe one or both coils may get weak when they get hot? Its really got me scratching my head! About 250 hours on it and it ran like a beast and now letting me down...
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Finally fixed, after trying everything else, my last attempt before ordering a new carburetor, I took the original carburetor off and took everything off and cleaned it out with a full can of carburetor cleaner, I noticed about 4 grains of sand in the bottom of the dish that I was using to catch the cleaner , after I put it back together, I have not had any more trouble , thanks everyone for the suggestions , Gary
 
bentrim said:
When it shuts down have you checked the antifire solenoid (if it has one) in the carburetor bowl? Sometimes when they get hot they will not work properly and close. May have to check for a missing heat shield or fabricate one.
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Also, check the wiring to the fuel solenoid. A chaffed wire or poor connection should be looked for.
 
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