Cummins/Onan B43 / B48 — Governor Adjustment - Variable Speed
Adjustments
For the Cummins/Onan B43 / B48, from the Cummins/Onan service manual.
Applies to: Cummins/Onan B48
Procedure
- Disconnect linkage (A) from one of holes (C).
- Push linkage (A) and governor arm (B) as far back (toward carburetor) as they will go.
- Holding linkage and governor arm toward carburetor, insert end of linkage into whichever hole (C) in governor arm lines up closest; if between two holes, insert in next hole out.
- Adjust governor link length so that with engine stopped and tension on governor spring, throttle shaft stop almost touches carburetor side stop.
Tools required
- tachometer Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Full service-parts list: Cummins/Onan B48 →
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.