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Hello. My name is Tan.
Does the engine still have spark after it quits and won't restart?
Do both engines run off the same fuel tank?
When was the last time you had the engine tuned up? Are you still using points ignition. A condenser can start to break down and cause ignition issues and the engine can still have spark it will be very weak. Have you tested for voltage at the ignition coil positive side when engine starts to act up. If you are still using points you could also have a ballast resistor breaking down causing loss of voltage to the coil. You can still have spark but very weak.