Cummins/Onan FM-JFE2 — Timing Magneto to Advance Spark
Adjustments
For the Cummins/Onan FM-JFE2, from the Cummins/Onan service manual.
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Procedure
- Turn shaft opposite normal rotation until distributor arm is at tower for No. 1 cylinder.
- Use thin paper between points to determine exact instant of breaker point opening.
- Turn engine until advance spark mark on flywheel is correctly located on compression stroke of No. 1 cylinder.
- Couple magneto to engine.
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.