Checking and Replacing Spark Plugs

CAUTION: Touching hot surfaces can burn skin. The engine, components, and fluids will be hot if the engine has been running. Allow the engine to cool before servicing or working near the engine and components.

IMPORTANT: Do not clean spark plug area with spark plug removed.

1. Park machine safely. (See Parking Safely in the SAFETY section.)

2. Clean area around both spark plugs.

3. 
   TCAL43510-UN-21MAR13

   Model Z915B shown. Engine access grill removed for clarity.

   Disconnect the spark plug wire (A) from each plug.

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4. Remove and inspect spark plugs:

   • Clean each plug and check for damage, replace if necessary.
   • If plugs are in good condition, check gap.
   
   

5. 
   TCAL43511-UN-21MAR13

   Check and adjust spark plug gap (B) to specification.

   Item	Measurement	Specification
   Spark Plug	Gap	0.76 mm (0.030 in.)

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6. Install spark plugs.

   • Kohler Engines: Tighten to specification.

     Item	Measurement	Specification
     Spark Plug	Torque	27 N·m (20 ft-lb)

   • Kawasaki Engines: Tighten to specification.

     Item	Measurement	Specification
     Spark Plug	Torque	22 N·m (16 ft-lb)

   
   

7. Install both spark plug wires.