Cummins/Onan — Carburetor Assembly (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
- Forcing the mixture adjustment screws tight will damage the needle and seat.
Procedure
- Install throttle shaft and plate with new screws and lockwashers; center the plate.
- Install choke shaft and plate; center in same manner.
- Install fuel inlet valve seat and valve.
- Install float, float pin and float spring; center pin so float bowl does not ride against it.
- Check float level with the carburetor casting inverted.
- Install main and idle mixture screw assemblies; turn in until lightly seated then out the specified turns.
Specs & values
- CCK/CCKA idle 1 to 1-1/4, main 1-1/4 to 1-1/2 turns; CCKB idle 1-1/2, main 2 to 3 turns
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.