That might be the saddest looking engine compartment I've ever seen.
If that's indicative of how you run your operation, it's no wonder to me that the motor doesn't want to run. When's the last time the motor got new spark plugs? How long have those plug wires been on there? Have you monitored the fuel pressure at the carb? Cleaned and/or replaced the fuel filter? Set the carb float? Have you ever done a compression test on the motor or had a vacuum gauge hooked up to the intake manifold? Sad lookin' deal Jo-Jo.