Generac — Load Adjustment (Gaseous Fuel Carburetor)

Adjustments · Gas carburetor

From a Generac service manual covering: IM100G, IM80G, NP100G, NP80G. Check it applies to your exact model before use.

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Procedure

1. Connect an AC frequency meter to the generator AC power output leads.
2. Disconnect all electrical loads.
3. Turn the load adjustment as far as it will go toward the R (maximum rich).
4. Start the engine, let it stabilize and warm up at no-load.
5. Apply an electrical load equal to rated maximum continuous wattage/amperage capacity.
6. Slowly turn the load adjustment toward L (leaner) until engine runs rough and frequency decreases.
7. Turn back toward R until engine runs rough and frequency decreases.
8. Turn toward L until smooth operation and highest frequency is obtained.
9. Turn off all electrical loads and check no-load frequency should be 60.5-63.5 Hertz (60 Hz units) or 49-52 Hertz (50 Hz units).

Source: Generac service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.

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