Kohler L600 / L654 — Spark Plug Service
Maintenance · Spark plugs
For the Kohler L600 / L654, from the Kohler service manual.
Applies to: Kohler L600 engine
Procedure
- Every 100 hours remove plug, check condition and reset gap.
- Light gray or tan deposit indicates good operating conditions.
- Dead white blistered coating indicates overheating; black carbon coating indicates overrich mixture.
- Do not sandblast, wire brush or scrape a plug in poor condition - use a new plug.
- Set gap .025 inch for gasoline or .018 inch for gas and shielded plugs and tighten to 22 ft. lbs.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Spark plug gap .025 inch gasoline
- Spark plug gap .018 inch gas/shielded
- Torque 22 ft. lbs.
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.