SOURCE: Craftsman lawn tractor model new battery drains quickly...
it could be the stator in the engine check the voltage with the volt meter when its running if its low check connections on battery & voltage if its below 12.5 volts then its the stator but the only thing is the engine should run with-out the battery so there is something else going on there is a fuse in the electrical system if theres a short that fuse will blow & engine will stall
SOURCE: Describe your 20 Hp 42"
The float an needle are stuck open causing the fuel to drain from the tank or be pumped by the fuel pump into the carburetor bowl, filling it and flooding the engine and filling up the air cleaner. You may even find that it has gone into the crank case sump contaminating the oil. Do not run until you have repaired the carburetor and changed the oil and if air filter got contaminated, that changed too.
I hope this is helpful for you.
SOURCE: hEAVY VIBRATION OF MOWER DECK (CRAFTSMAN17.5 HORSE TRACTOR?)
Even new blades can be out of balance, but my guess would be either the other blade spindle, or the tensioner pulley bearing.
check for spark when it dies you could have a bad coil
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