Toro Timemaster 30" shuts off after 20-25 mins

I'm having this same issue with a 6 year old timemaster, changed oil, new plug, new fuel filter, new blades, new air filter, new ignition coil, new gas cap. all parts have been oem. i even dropped the carb and cleaned the bowl (it was spotless anyway). the symptom ocurrs only when its above 80ish outside...seems i can prevent it by quickly letting go of all handles and letting it run idle for 30 seconds, only to start up again and 5 min later the issue happens much quicker and i cannot prevent it. if i try to restart, it wont even spit, almost like there is no spark, which is why i replaced the ignition coil. any more ideas?
 
Check for debris in the tank. No debris you’ll have to figure if it is fuel or spark. Next time it happens and you can’t get it started, check for spark. Good spark, fuel problem and we’ll go from there.
 
Rivets said:
Forget the PET-4000 unless you are in the repair business. This tool is not worth of cost for a DIY guy.
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Well I don't have one
But I do have a B & S fixed 3 point tester that is 1/3 the price but I rarely use it either as coils can not be repaired .
So much easier just to pull the plug cap away till the engine stops
Any more than 1/2 " and the coil strength is fine
Used to be the old way of cleaning an oil soaked or carbon fouled plug on car engines
Back in the 20's through to the 50's when magneto motorcycles were the norm a common "fix" for a blown capacitor in a Lucas magneto was to cut the HT lead, solder a small brass button to both ends then slide them into a piece of hose leaving them 1/2" to 1/4" apart
 
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Rivets said:
Check for debris in the tank. No debris you’ll have to figure if it is fuel or spark. Next time it happens and you can’t get it started, check for spark. Good spark, fuel problem and we’ll go from there.
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ok, no tank debris, when it died i used my spark tester and saw it lighting up, so i think im getting spark. it died even quicker this time, like 20 minutes into mowing rather than 30...its also very hot today but its the only time i can cut...so this definately seems heat related. of note, the spark plug boot was so hot i couldnt pull it off by hand, i had to use pliers...and once i had the tester on the plug for about 4 minutes, the tester boot heated up so much it was also too hot to pull off without pliers...so that plug must be crazy hot...ideas?
 
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I had the same issue, when it stalled I checked the fuel filter and it was nearly empty. When I opened the cap I could see the filter filling up and the mower started up.
I took the cap off and checked the vent holes and they looked fine, when I blew or sucked on the cap no air was passing through it.
I drilled out the vent holes and found the cap was full of charcoal pellets, I shook those out and found a small screen rattling around in the cap. Left it like that and was able to blow and suck air through the vent hole.
Next mow was fine no issue with stalling.
Check the vent in the gas cap....
 
You just removed the air filter components to keep debris out of the gas tank. Hope you understand what could happen down the road.
 
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