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Home›Repair guides›Cummins/Onan›Adjusting the carburetor

Cummins/Onan GS-107-AC — Adjusting the carburetor

Adjustments

For the Cummins/Onan GS-107-AC, from the Cummins/Onan service manual.

Applies to: Hol-Gar GS-107-AC, Cummins/Onan J120-S/967F engine

Before you start

  • Do not force needle valves against their seats

Procedure

  1. Warm up engine; verify ignition system and governor are adjusted.
  2. With engine idling, turn idle adjustment out until speed drops slightly.
  3. Turn needle in until speed returns to normal.
  4. Apply a full load to the engine.
  5. Override governor and check acceleration.
  6. Adjust main needle outward 1/2 turn; repeat until no lag.
  7. Set throttle stop screw for 1/32 inch clearance at no load.

Specs & values

  • Throttle stop 1/32 inch clearance at no load

Full service-parts list: Hol-Gar GS-107-AC →

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.

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