Kohler Unstable Engine Operation / Surging

Generator starts but runs rough, surges, or hunts at no load.

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Incorrect fuel mixture or pressure, dirty carburetor or demand regulator, vacuum leaks at the intake manifold, or ignition misfire due to worn plugs.

Safety first: Turn the generator OFF and open the main breaker before removing covers.

Air filter: Replace a dirty air filter to ensure proper airflow.
Fuel supply: Have the gas pressure checked under load to ensure it meets Kohler specifications.
Inspect vacuum lines: Check hoses to the demand regulator and intake for cracks or disconnections.
Ignition tune-up: Replace spark plugs and inspect ignition wires and coils.

If surging persists, the demand regulator or carburetion system may need cleaning or adjustment by a Kohler technician.

Medium 3/5

Demand Regulator

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