Small Engine Troubleshooting Problems? Ask a Mechanic Now.
Welcome to JUST ANSWER small engines, let me try to help you !! I don't know it all, but maybe together we can get you a satisfactory answer!
Do you have a voltmeter to check the battery voltage? The electric pto clutch is a big user of voltage, and if battery is weak or cables corroded, you will lose voltage to the electric clutch, and it will stop. It has to have 12 volts or it will drop out.
I see question is still open. Did you find reason that pto does not stay engaged?Battery voltage good?