Rugged when it runs rough or cuts out IS THERE A LOT OF BLACK SMOKE COMING OUT THE EXHAUST??
If so that will gas foul the plugs and they may get that flat black sooty look indicative of excess fuel.
The carbs bowl had a float that at the correct level it rises (unless it has a leak) and shuts off the needle valve so gas stops entering the bowl at the correct level. Often the needle valve and seat may get corroded or trap a small speck of dirt or crud or rust etc etc so it cant shut the gas off AND SHE FLOODS OUT runs over rich and can foul the plugs.
Checking the needle valve n seat and float and float level isn't too hard or rocket science but I'm not gonna try and explain it over the net. If you remove any air inlet pipe or tube and turn the gas on YOU SHOULD NOT GET GAS OVERFILLING THE BOWL AND RUNNING OUT THE CARB. If so again I suspect a leaky float or the float level is too high or the needle valve isn't working correct. I usually drop the float and check all that but you gotta know what to do and be careful
If its NOT flooding the bowl maybe the carb is adjusted too rich which would yield black smoke and foul the plugs
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