Generac Gen issue

[gresults]

On my generac gen, been having issues when underload of with slow down and up and black smoke., just not able to keep up with load.

Think it might be dirty fuel filter, but any other pointers would be plus.

[RV Wizard]

I would do a complete service; all filters, new fuel and plugs and then see if it still gives a problem. You did not say how many hours are on the genset and if you have been running it regularly; not allowing fuel to go bad in the carburetor.

[gresults]

Sorry unit has about 225 hours on it, pretty much run it everyweek a little bit did the first recommended service at 200 hours oil/filter

[gresults]

Well did discover now that the spark arrestor was totally clogged., removed it and seems to have helped.