Cummins/Onan 4.0 BF-1R/9500 — Breaker Points Replacement (Cold Setting)
Maintenance
For the Cummins/Onan 4.0 BF-1R/9500, from the Cummins/Onan service manual.
Browse Cummins/Onan generators & specs →
Procedure
- Remove two screws and cover on the breaker box
- Remove two spark plugs so engine can be easily rotated by hand
- Remove mounting nut (A) and pull points out far enough to remove screw (B) and disconnect leads
- Remove screw (C) and replace condenser with a new one
- Replace points with new set but do not completely tighten mounting nut (A)
- Remove dot button on blower housing to view timing mark
- Rotate engine clockwise until 26 degree BTC mark aligns with flywheel mark; turn another 1/4 turn
- Using screwdriver in notch (D), turn points until gap measures .025 inch with flat thickness gauge; tighten and recheck gap
- Check ignition timing
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Points gap .025 inch cold
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.