Kohler — Ignition Module Air Gap Adjustment (Smart-Spark)
Adjustments
From a Kohler service manual covering: CH18, CH20, CH22, CH23, CH25, CH620, CH630, CH640, CH670, CH680, CH730, CH740…. Check it applies to your exact model before use.
Applies to: Kohler CH18, Kohler CH740
Procedure
- Turn flywheel magnet away from module position.
- Attach module to mounting legs, pull away from flywheel, and tighten screws temporarily.
- Rotate flywheel so magnet is centered under module.
- Position a 0.30 mm (0.012 in.) feeler gauge between magnet and all three legs of module.
- Loosen mounting screws, allow magnet to pull module down against feeler gauge, and retighten mounting screws.
- Rotate flywheel to remove feeler gauge, position magnet back under module, and recheck gap. Torque module mounting screws to 4.0 N·m (35 in. lb.).
Tools required
- 0.30 mm feeler gauge Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- 0.30 mm (0.012 in.)
- 0.28 mm (0.011 in.) minimum
- 4.0 N·m (35 in. lb.)
Full service-parts list: Kohler CH740 →
Source: Kohler 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.