Cummins/Onan 1B Series — Automatic choke adjustment
Adjustments · Carburetor
For the Cummins/Onan 1B Series, from the Cummins/Onan owner's manual.
Browse Cummins/Onan generators & specs →
Before you start
- Do not lubricate the choke shaft.
Procedure
- Loosen bimetal housing screw or bimetal fastening screw.
- Turn housing or screw as necessary and retighten.
- If new bimetal installed, note original counterclockwise spiral inward direction.
- Reversed spiral increases choking and may stop plant.
- Pin at bottom indicates choke plate position.
- Do not lubricate choke shaft; clean with solvent if dirty.
Source: Cummins/Onan owner's 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.