goodolboat, checking the spark at the time of failure is a must. As it topped suddenly it could still be electrical in nature~~don't forget to check the ignition for voltage from the Ign switch. The switch can get intermittent and drive you nuts. It can be checked with a meter or when she fails run wire from a HOT+ feed (battery a good place or the starter feed and take it to the coil + and see if she starts.
With your sediment issues a check of the carb is in order.
Dave Neptune
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