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i just bought a used simplicity riding mower,its a 2014,looks like brand new,the problem i have is when the pto is engaged it runs for a split second and kills the engine,everything worked when i got it ,the belt is on correct,and bearings not froze,its not the deck,its like you turn the mower off,if you push the pto back in fast the engine will still run ,installed a new pto switch ,same problem,is it in the wiring???

I would check the PTO bearings

the bearings move freely,the engine stops when i pull the pto switch,just like you turn the key off,it does turn on for a split second,then off

is it starving for fuel like a dirty carburetor

no runs fine

Check voltage to PTO. Should be what ever you are getting at battery with wide open throttle. You are turning the PTO on with WOT? If everything is good then start checking you safety switches.