The first thing to check after it dies would be if you are getting spark. If I recall correctly these engines had overtemp sensors that were just thermal switches that killed the spark. Might explain why it started the next day after cooling off. When was the last time the water pump impeller was changed? After sitting four years it might not be flexible enough anymore. I think these engines also had thermostats that were prone to sticking.
Jerry
I went out to the barn and it started right up this morning. So I am now leaning towards this as opposed to a fuel issue. The water pump was working fine the other day and yesterday. FWIW, it had no starting issues before, just yesterday at the lake. The issues my mechanic addressed were just gunked up fuel in the tank and engine after setting.
