M-ZT 52 Stops running when hot!

[littlegman]

Taryl made a video explaining the coil tester types. He said and I agree, the light bulb type does not give the full picture of coil performance. Taryl said to get the Briggs type or even better the PET-4000. He had a coil that would fire at low revs then crap out at mid and high revs. I've seen the same thing several times. Reason why I bought a PET-4000.
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Does the engine die suddenly like you turned the key off (electrical), or kind of chug a bit and come to a halt (fuel)?

Thank you for all the tips. Mine kind of chugs a bit before coming to a halt, I believe it has to be the fuel because it will try to start with the choke on but will die out. After about 20 minutes or so, it will start again like there is no problem. I did change the fuel pump and filter but didn't seem to help. I replaced the fuel pump with a chinesee one off amazon and after I read to get that sometimes they are defective also. I do have a inline spark plug tester similar to the one in the other reply.

 

[littlegman]

Pull fuel line off AT carb inlet. See what you get when cranking the engine.

Even better, crank/pump into a glass jar and look for water.

Most likely fuel tank is plugged with grass, bugs, dirt dobbers and leaves. Tank output knecks down and trash plugs this up. Dead tank cap gasket adding to the mix.

yes and everything is clean under the shrouds

 

[littlegman]

Get yourself an inline spark tester and the next time it happens install the tester and check for spark. I suspect you will find no spark. You have either a hot short ot hot open, which means the coil will need to be replaced.

thanks, I have a inline tester that I will try

 

[Auto Doc's]

This has me leaning towards a coil breaking down when hot. The spray bottle shooting a stream of water on the exhaust pipe works well. If the water immediately burns off, the cylinder is producing power. If the water is slow to burn off, that is a cylinder not producing power.

Firmly bolted V-twin engines do not rock or give an obvious indication when one cylinder drops out, it just loses power and will stall, especially if the deck is engaged.

The second suspect is there is a floating chunk of debris or a dead bug that is intermittently blocking the fuel line spigot/ pickup in the fuel tank.

 

[mikewdan]

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 ?

May sound a little silly but if none of the other ideas have not worked for you, check gas cap to make sure it is vented properly. I had this same thing keep happening to me and found that simple thing to be the problem.

 

[Wrenchit]

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 ?

The gas cap vent stopped up. It's rare, but I have seen it happen a few times.
Also, when it quits, pull the plug wire and check for spark. Filing coil/s will shut an engine down until they cool off and start again. Then quit when hot.
Most fuel filters are rarely full when running, some look like there is not enough fuel to run, but they will.

 

[toolboxhero]

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 ?

I haven't heard of this problem on a Husqvarna but it fairly common on the Cub Cadet lawn tractors.
The vent on the fuel cap may be plugged. It makes sense in your situation because the fuel filter is empty.
Open the fuel cap 1/4 to 1/2 turn and see if the problem goes away. If it does get a new cap.

 

[bentrim]

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.

 

[Back44L&G]

Get yourself an inline spark tester and the next time it happens install the tester and check for spark. I suspect you will find no spark. You have either a hot short ot hot open, which means the coil will need to be replaced.

I just went through that last week. I cleaned the carburetor, emptied and cleaned the tank. I removed the ignition module and cleaned the armature and checked the gap at ten thousands. The mower ran longer but spark diminished over time shutting down the engine. Then I purchased a replacement ignition module (coil) that corrected the problem. No further issues.

 

[Gord Baker]

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 ?

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.