Cummins/Onan — Gas-Gasoline Carburetor Adjustments
Adjustments
From a Cummins/Onan service manual — check it applies to your exact model before use.
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Procedure
- When operating on gasoline, use gasoline carburetor adjustment procedures.
- Ensure choke lock wire is removed.
- Turn idle fuel adjusting screw out until engine speed drops slightly; then turn screw in until speed returns to normal.
- Apply a full load to engine.
- Turn in gas main adjustment screw until engine speed drops; then turn out screw until engine speed returns to normal.
Specs & values
- Factory set for gas rated approximately 1000 BTU; readjust if substantially different.
Source: Cummins/Onan 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.