Cummins/Onan FM-JFE2 — Magneto Timing to Impulse Spark
Adjustments
For the Cummins/Onan FM-JFE2, from the Cummins/Onan operator's manual.
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Procedure
- Remove the distributor cap.
- Turn the magneto shaft in the proper direction of rotation until the impulse coupling has been tripped.
- Note which tower the distributor arm is nearest and the cylinder to which it is connected.
- Turn the engine to top dead center on that cylinder on the compression stroke.
- Time the magneto so the impulse breaks and spark occurs on the top center mark.
Tools required
- Thin piece of paper Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Spark on top center mark
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.