Cummins/Onan — Carburetor Adjustment (Gas or Vapor)
Adjustments
From a Cummins/Onan owner's manual — check it applies to your exact model before use.
Browse Cummins/Onan generators & specs →
Before you start
- If adjustment must be opened much beyond normal voltage point, governor readjustment may be necessary.
Procedure
- With full load on plant, turn knurled head gas adjustment valve in clockwise until voltage drops noticeably or engine loses speed.
- Turn screw slowly out counterclockwise until voltage rises to normal and engine runs smoothly.
- Check operation at various loads.
- See that throttle lever stop screw is adjusted to 1/32 in. clearance at no load.
Specs & values
- 1/32 in. throttle stop clearance at no load
Source: Cummins/Onan owner's 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.