The Yamaha EF2400iS takes the NGK BPR4ES spark plug as its spark plug; Australian sellers list it from A$7.29 as of 3 November 2026. Fitment confirmed against the manufacturer's compatibility list.
Your generator
Yamaha EF2400iS
Inverter generator
Confirmed against Yamaha's listConfirmed against Yamaha's own compatibility list
Not yours? Change
Takes the BPR4ES spark plug
BPR4ES spark plug · check the code on your old part before ordering.
NGK BPR4ES (Yamaha part 94702-00331), gap 0.7-0.8 mm, tightened to 17.5 N·m.
Your generator
Inverter generator
Confirmed against Yamaha's listConfirmed against Yamaha's own compatibility list
Takes the BPR4ES
Spark plug · check the code on your old part.
NGK BPR4ES (Yamaha part 94702-00331), gap 0.7-0.8 mm, tightened to 17.5 N·m.
Other Yamaha generators that take the BPR4ES
GenuineGenuine NGK
$7.29
Power Mowers · 3 NovLowest genuine · Power Mowers · checked 3 Nov
CompatibleCompatible option
See seller
No compatible seller tracked yetNo compatible seller tracked yet
Genuine: made by NGK. Compatible: another brand.Genuine is made by NGK. Compatible is made by another brand. Check the seller's page for the size and models it fits.
Lowest price · $7.29
Power Mowers. Every seller we track is listed below. Some links earn us a commission. Some seller links earn us a commission, at no extra cost to you.
Compare 3 listings from 2 sellers
AUD, before delivery. Each price shows when it was checked.
Genuine NGK
3 listings from 2 sellers
Opens Power Mowers in a new tab. Their page is the source of truth for price, delivery and returns.
How long it lasts
Replace it when it is worn or fouled; Yamaha's EF2400iS and EF3000iSE manuals say to check, clean and re-gap it every 3 months or 50 hours.
After replacing: No reset needed.
How to change the spark plug in your Yamaha EF2400iS
Watch the guide or follow the steps.
- 1Let the engine cool. On the EF2400iS and EF3000iSE loosen the bolt and remove the side cover.
- 2Remove the spark plug cap and the spark plug.
- 3Check the gap on the new plug: Yamaha gives 0.7-0.8 mm.
- 4Fit the plug and tighten it (Yamaha gives 17.5 N·m for the EF2400iS and EF3000iSE), then refit the spark plug cap.
- 5On the EF2400iS and EF3000iSE, refit the side cover and tighten the bolt.
Every number this part goes by
- Retail name:
- 94702-00331
- Retail name:
- 94702-00819
- Retail name:
- BPR4ES
- Retail name:
- NGK BPR4ES
Sellers list any of these; they are the same part.
About your Yamaha EF2400iS
Yamaha generator, inverter generator — EF inverter. Its spark plug is the BPR4ES spark plug, part BPR4ES.
Where the model number is: The model is on the label on the generator's side panel or frame (Honda EU22i, Yamaha EF2000iS), with the serial number, and on the box. Switch the engine off and let it cool before you open a cover.
Fits these 5 Yamaha models
Yamaha5 models
EF3000iSEB. NGK BPR4ES, gap 0.7-0.8 mm, tightened to 17.5 N·m.
EF6300iSDE. NGK BPR4ES, gap 0.7-0.8 mm.
EF7200E. NGK BPR4ES (Yamaha part 94702-00819).
The other 2 models. NGK BPR4ES (Yamaha part 94702-00331), gap 0.7-0.8 mm, tightened to 17.5 N·m.
Common questions
- Which spark plug fits the Yamaha EF2400iS?
- The Yamaha EF2400iS takes the NGK BPR4ES spark plug. NGK BPR4ES (Yamaha part 94702-00331), gap 0.7-0.8 mm, tightened to 17.5 N·m.
- Where can I buy the BPR4ES in Australia?
- We track 2 Australian sellers for the BPR4ES; the lowest listed price when we last checked was A$7.29 at Power Mowers. Prices are re-checked daily and dated on this page.
- How do I fit the BPR4ES in a Yamaha EF2400iS?
- 5 steps, listed on this page with the replacement video where the maker has one.
- What happens if I don't change it?
- A worn or fouled plug makes the generator hard to start and run unevenly under load.
- Is there anything to reset afterwards?
- No reset needed.
Something looks wrong with the EF2400iS match? . Reports go to a person, not a bot.