Small Engines (Lawn Mowers, etc.): Husqvarna ridr w/B&S engine shuts off, briggs stratton, hp briggs

Question
Husqvarna riding mower has a 23 hp Briggs & Stratton Intek V-Twin engine. Runs somewhere between 15 mintues to an hour then abruptly hesitates/sputters and stops. Might be able to restart after a minute or two working the choke.  Then, might run short time (10-15 minutes) or longer (up to around 30-45 minutes) and shut down again.  Or, on the warm engine re-start engine will immediately cycle/hunt a few times then shut down. After engine has cooled, it easily starts and will run for another 30 minutes or so with no problem but then shuts down again.  Is something overheating, causing it to shut down? Thinking there might be a vapor lock, I've loosened/opened the gas cap a few times while mowing, but it will still shut down.  Also, in experimenting, I've set a concrete block on the seat and let it run with the blade on and it runs forever with no problem (I stopped in at 1-1/2 hours).  So, it seems the problem occurs only when the transmission is engaged (hydrostatic trans).  Any thoughts on what the problem could be. Does Husqvarna have a problem with some sort of switch or other component apart from the engine that would shut it down.  It has a new air filter, pre-cleaner, plugs, and fuel filter.  Shop tells me the engine, plugs, ignition coils, etc., check out OK and they can't get it to shut off for them (because they ain't riding it!).

B&S Intek V-Twin Engine Model:  445577,  Type: 0755E1, Code 061205Y-G

Thank you for your time -

Ron


Answer
Ron,

  It is true they wont ride it because of insurance and liability But Since it does this while your riding it indicates a problem with maybe a fuel solenoid Or a Sensor.
Husqvarna Dont have a notorius issue with thier Mowers but sometimes a sensor or even a fuel solenoid can be the culprit.
I put my Money on the fuel solenoid because from what your saying if it runs great for a short period and dies then restarts  runs and dies I would have the Shop pull it and and put another one in Or at best test the continutiy and the device iteself.
the reason it ran with the concrete block and blades going was because your not putting any real stress on the fuel system when your riding it and the tranny is engaged it causes the parts to work 10 times harder because instead of sitting still  it has to move the tractor and keep the blades spinning at a constant 5000RPMs while cutting grass.
But Just to be safe have the shop also look at the fuel pump as well something is shutting down the fuel system
Fuel Solenoid
Fuel Pump
something may also be Obstructing the fuel system
If they cant find it then let me know we can definatly work this out Ron