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Home›Repair guides›Yamaha›Spark Plug Inspection

Yamaha EF1000iS — Spark Plug Inspection

Maintenance

For the Yamaha EF1000iS, from the Yamaha owner's manual.

Procedure

  1. Remove the cover, then remove the spark plug cap
  2. Remove the spark plug with a tool
  3. Check for discoloration and remove the carbon
  4. Check the spark plug type and gap
  5. Install the spark plug
  6. Install the spark plug cap and cover

Tools required

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

Specs & values

  • Standard spark plug: CR4HSB (NGK)
  • Spark plug gap: 0.6-0.7 mm (0.024-0.028 in)
  • Spark plug torque: 13 Nm (1.3 m·kgf, 9.4 ft·lbf)

Source: Yamaha owner's 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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