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Generac — Check and Adjust Ignition Magnetos

Adjustments · Ignition magneto (armature)

From a Generac service manual covering: GPS 12500, GPS 15000, GPS 17500. Check it applies to your exact model before use.

Applies to: Generac GPS 12500, Generac GPS 15000

Procedure

  1. Rotate flywheel until magnet is under module (armature) laminations.
  2. Place 0.008-0.012 inch (0.20-0.30 mm) thickness gauge between magnet and laminations.
  3. Loosen mounting screws and let magnet pull magneto down against thickness gauge.
  4. Tighten both mounting screws.
  5. Remove thickness gauge by rotating flywheel.
  6. Repeat procedure for the second magneto.
  7. Repeat Test 29 and check for spark across spark tester gap.

Tools required

Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.

Specs & values

  • 0.008-0.012 inch (0.20-0.30 mm) air gap

Source: Generac 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.

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