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!
What is the engine make and model? Not listed under the Yard machine model.
Twin engine, run a cylinder test. Loosen the spark plug wires and remove one wire at a time, if engine dies when one wire is removed, the opposite cylinder is not firing. Does it have spark, does it have compression? Is this OHV engine or the older opposed flat head engine?
No safety switch on the deck. Sounds like voltage may be dropping, what is battery voltage when it acts up? Then when you turn blades off? Is charging system keeping up charge in battery?