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There is debri or dirt in gas tank and eventually it gets sucked up and clogs the screen filter on the end of gas line. Drain gas tank and flush out a few times. let dry and put new gas in it. check your gas can, if it is metal, it may have rust in the bottom of it and it goes in the gas tank and clogs screen, make sure you have a clean gas can that you use to fill the generator.
I have an HM100 on a 5500 watt gen with the same problem. This motor calls for a J17 spark plug, but I found using a J19 (hotter) plug solved the problem. I think the J17 doesn't get hot enough for a complete combustion burn so it act like fuel starvation thus resulting in the black sooty and wet plug.
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