Speed Electrical Supplies - Recent Questions, Troubleshooting & Support
Predator generator 4000 problems idle speed up and down
Engine surge/governor hunting are usually a carburetor issue.
First check air filter, drain fuel tank, drain and clean carburetor fuel bowl. Then use fresh fuel from a clean dry fuel can.
If its still hunting, check that the carburetor mounting bolts are not loose. If carburetor mount is good, then the carburetor likely needs cleaning or replaced.
You could also try SeaFoam or other similar fuel treatment. Just follow label directions, usually 1 oz / gal... measure don't guess.
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