Cummins/Onan 205AJ — Carburetor adjustment - gasoline
Adjustments
For the Cummins/Onan 205AJ, from the Cummins/Onan operator's manual.
Applies to: Cummins/Onan AJ series
Procedure
- Turn adjusting needles in gently to seats; do not force.
- Back main needle out about 2-1/2 full turns.
- Back idle needle out about 3/4 turn.
- Start plant and warm up under full load.
- Slowly turn main needle inward until plant loses speed or voltage drops.
- Turn main needle outward until plant carries full load.
- If hunting, turn main needle out for richer mixture, not more than 1/2 turn beyond maximum output.
- Adjust idle needle warm, batteries connected, no AC load; turn inward until plant loses speed, then outward until smooth.
- Adjust throttle idle stop screw to clear throttle shaft stop by 1/32 in at desired speed and no load.
Specs & values
- Main needle initial 2-1/2 turns out
- Idle needle initial 3/4 turn out
- Throttle idle stop clearance 1/32 in
Full service-parts list: Cummins/Onan AJ series →
Source: Cummins/Onan operator'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.