Cummins/Onan — Carburetor Disassembly (Gasoline and Gas-Gasoline)
Repair & overhaul
From a Cummins/Onan service manual — check it applies to your exact model before use.
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Before you start
- Always perform carburetor repair under the cleanest conditions possible.
Procedure
- Remove two screws fastening the automatic choke and remove assembly.
- Remove throttle and choke plate retaining screws and plates; pull out shafts.
- Remove main and idle adjustment screw assemblies.
- Separate upper and lower carburetor sections (downdraft) or remove fuel bowl (sidedraft).
- Remove float retaining pin, float assembly, springs/clips and needle valve.
- Unscrew and remove needle valve seat.
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.