Cummins/Onan — Thermal Magnetic Choke Adjustment
Adjustments
From a Cummins/Onan service manual — check it applies to your exact model before use.
Applies to: Cummins/Onan CCK engine
Procedure
- Allow engine to cool at least one hour.
- Remove air cleaner and adapter.
- Loosen screw securing choke body.
- Rotate choke body clockwise to increase choke, counterclockwise to decrease.
- Measure choke opening with drill rod.
- Tighten screw.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
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.