Yamaha EF1000iS / EF4500iSE — Spark plug inspection
Maintenance
For the Yamaha EF1000iS / EF4500iSE, from the Yamaha owner's manual.
Procedure
- Remove screws, pull out front cover.
- Remove spark plug cap and spark plug.
- Check for discoloration and remove carbon.
- Check spark plug type and gap; adjust to specification with wire thickness gauge.
- Install spark plug (1/4-1/2 turn past finger tight if no torque wrench).
- Install spark plug cap.
- Install front cover and tighten screws.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Standard spark plug: BPR4ES FridayParts $49.00 (NGK)
- Spark plug gap: 0.7-0.8 mm (0.028-0.031 in)
- Spark plug torque: 20 Nm (2.0 m.kgf, 14 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.