Cummins/Onan — Carburetor Disassembly (Gasoline and Gas-Gasoline Only)
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 cleanest conditions possible.
Procedure
- Remove automatic choke if equipped: remove two screws and choke assembly.
- Remove throttle and choke plate retaining screws and plates.
- Pull out throttle and choke shafts, being careful not to damage Teflon coating.
- Remove main and idle adjustment screw assemblies.
- On downdraft carburetors, remove attaching screws and separate upper and lower sections.
- On sidedraft models, unscrew retaining screw and remove fuel bowl.
- Note float assembly position, slide out retaining pin, remove float, 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.