Cummins/Onan — Nikki Carburetor Throttle Stop (Idle) Adjustment
Adjustments · Nikki carburetor throttle stop screw
From a Cummins/Onan service manual — check it applies to your exact model before use.
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Procedure
- Connect frequency meter to generator set and start at no load.
- Turn in throttle stop screw to contact throttle lever tab.
- Pull governor linkage toward engine and monitor frequency meter.
- Adjust screw to 55 +/- 1 hertz (60 Hz) or 45 +/- 1 hertz (50 Hz).
- Release governor linkage and check unit frequency and voltage.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- 60 Hz: 55 +/- 1 hertz (1650 +/- 30 r/min)
- 50 Hz: 45 +/- 1 hertz (1350 +/- 30 r/min)
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.