Cummins/Onan — Carburetor adjustment, Power Unit PE-95-(1)
Adjustments
From a Cummins/Onan service manual — check it applies to your exact model before use.
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Procedure
- Set throttle-stop screw 38 so throttle is slightly open; set throttle control arm about one-third open.
- Pull out manual choke and set MANUAL START-REMOTE START switch to MANUAL START.
- Crank unit by hand and partially open choke as engine starts; set choke wide open as engine warms.
- With governor disconnected, set throttle to idle position and adjust throttle-stop screw 38 for correct idle speed.
- Turn idle adjusting needle 12 in (clockwise) until engine falters, then counterclockwise until it runs smoothly.
- Place a load and turn power adjusting needle 1 in until power drops, then out until engine runs smoothly.
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.