first I'd verify if its fuel or spark. the octane wouldn't hurt it, fuel pumps usually work or they don't. dirt plugging something or loss of spark seam to follow your problem. next time it dies take a plug out and check for spark, if it does pull the fuel line from the pump to the carb and check for fuel pumping out. if that's ok it is probably the anti back fire valve on the carb or dirt in the carb
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