I suggest pulling the carb and draining the bowl. I don't know what it is about the mag18's but I have to do that to mine every 100 hrs or so. Only tractor I have trouble with, but water seems to collect in the carb.
At this point, im not going to sway to fuel or ignition. It's more that likely ignition.... but i know those mag engines really well and a little water in the fuel bowl will give them an intermittent miss.
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