Honda EB3000 / EB4000 — Spark plug service
Maintenance
For the Honda EB3000 / EB4000, from the Honda owner's manual.
Applies to: Honda EB3000, Honda EB4000, Honda GE300 engine, Honda GE400 engine
Before you start
- The spark plug must be securely tightened. An improperly tightened plug can become very hot and possibly damage the generator.
- Never use a spark plug with an improper heat range.
Procedure
- Remove the spark plug cover.
- Clean any dirt from around the spark plug base.
- Remove the spark plug cap.
- Use the wrench supplied in the tool kit to remove the spark plug.
- Visually inspect the spark plug; discard it if the insulator is cracked or chipped.
- Measure the plug gap with a feeler gauge; the gap should be 0.6-0.7 mm. Correct by bending the side electrode.
- Thread the plug in by hand to prevent cross-threading.
- Tighten a new spark plug 1/2 turn with the wrench to compress the washer; if reusing a plug, 1/8-1/4 turn after it seats.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Spark plug: BR4HS (NGK), W14FSR-U eBay (ND)
- Plug gap 0.6-0.7 mm (0.024-0.028 in)
- New plug: tighten 1/2 turn with wrench
- Reused plug: 1/8-1/4 turn after seating
Source: Honda 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.