Briggs and Stratton 17HP on Toro Z420 Quits When Hot

LawnMan01

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I'm out of ideas folks. My mower quits after 20-30 minutes of mowing. Replaced the carburetor, ignition coil, spark plug, fuel and air cleaner but still have the issue. I'm out of ideas. The "death" starts with idle dropping momentarily but comes back up if I slow down or stop forward movement. After 4 or 5 events of this nature, the motor drops out. I turn off the PTO and head for the garage with PTO disengaged but the motor stalls out.

This seems like poor fuel flow but I've checked the lines and everything flows clear.

I did note that the breather hose that comes off the top of the head back to the intake manifold keeps coming off. Is this indicative of another issue?

Hoping someone has some ideas.

Rick
 
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