Kohler — Spark Plug Maintenance Procedure

Maintenance · Ignition system

From a Kohler service manual covering: 12RES, 12TRES, 8.5RES. Check it applies to your exact model before use.

Applies to: Kohler 12RES, Kohler 12TRES, Kohler 8.5RES, Kohler CH20 engine, Kohler CH 740 engine

Procedure

Clean the area around the base of the spark plug.
Remove the spark plug and check condition; replace if worn or reuse is questionable.
Check gap with a wire feeler gauge; adjust by bending the ground electrode.
Install spark plug and tighten to specification.

Tools required

Wire feeler gauge Amazon

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

Specs & values

Spark plug gap 8.5 kW: 0.51 mm (0.020 in.)
Spark plug gap 12 kW: 0.76 mm (0.030 in.)
Spark plug torque 24.4--29 Amazon eBay.8 Nm (18--22 Amazon eBay FridayParts $45.30 ft. lb.)

Full service-parts list: Kohler 12RES →, Kohler 12TRES →, Kohler 8.5RES →

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.

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