Facts About Generators
GeneratorsDirectoryCompareRepairEnginesControllersPartsManufacturersGuides
Search models or part #
Home›Repair guides›Generac›Adjust ignition magneto air gap — V-twin

Generac GT-990 — Adjust ignition magneto air gap — V-twin

Adjustments

For the Generac GT-990, from the Generac service manual.

Applies to: Generac GH-410 engine, Generac GT-530 engine, Generac GT-990 engine, Generac GT-999 engine

Procedure

  1. Rotate flywheel until magnet is under module laminations.
  2. Place 0.008-0.012 inch (0.20-0.30mm) thickness gauge between magnet and laminations.
  3. Loosen mounting screws and let magnet pull magneto against gauge.
  4. Tighten both mounting screws.
  5. Rotate flywheel to remove thickness gauge.
  6. Repeat for second magneto.

Tools required

  • 0.008-0.012 inch thickness gauge Amazon

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

Specs & values

  • 0.008-0.012 inch (0.20-0.30mm)

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.

More Generac repair guides →