Cummins/Onan — Choke Adjustment (Thermo-Magnetic)
Adjustments · carburetor choke
From a Cummins/Onan operator's manual covering: 5JB, 601JB, 6JB, 6OLJB, 705JB, 705JB-3, 705JB-3CR, 705JB-4XR, 706JB, 7JB. Check it applies to your exact model before use.
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Procedure
- Allow engine to cool at least one hour before setting.
- Remove air cleaner and adapter to expose carburetor throat.
- Loosen the screw which secures the choke body.
- Rotate choke body clockwise to increase choke, counterclockwise to decrease (leaner).
Tools required
- drill rod or shank of drill bit (to measure choke opening) Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Source: Cummins/Onan operator'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.