Generac — Idle Mixture 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
- Connect an AC frequency meter to the generator AC power output leads.
- Disconnect all electrical loads from the generator.
- Start the engine, let it stabilize and warm up at no-load.
- Reduce engine speed until frequency meter reads approximately 30-33 Hertz.
- Slowly turn the idle mixture screw clockwise until engine starts to run rough, then counterclockwise until rough, then clockwise to smooth operation.
Tools required
- AC frequency meter Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
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.