NGK spark plugs S4

alan s4 · 21-04-2023, 10:38 AM

Can someone give me the EXCACT code for NGK plugs for my S4. OEM Champions are stupid money.

Tried iridium and they sooted up and were oily very quickly, so want to go back to NGK. Ordered a set online however the little nipple thing on the top was fixed and I need to get it off. I thought you could screw off for most spark plugs!

Thanks

Luddite · 21-04-2023, 11:53 AM

If your standard plugs are RA59GC, then I think the direct NGK equivalent is the DCPR9E. However, this only comes with a solid terminal nut. The only NGK fitment I'm aware of with a removable terminal nut is the iridium version DCPR9EIX.

Before giving up on the iridiums, are you sure you ran them with the correct gap? They need to be at 0.9 - 1mm to work properly.

http://www.ukmonster.co.uk/monster/s...72&postcount=4

http://www.ukmonster.co.uk/monster/s...2&postcount=12

alan s4 · 21-04-2023, 12:27 PM

The S4 runs coil sticks so the terminal nut needs to be removable.

Ive got NGK Iridium’s in my 996 and it runs happily on them. The S4 916 engine doesn’t get on with them at all, gap checked as well.

Has anyone got an equivalent code for another brand?

Mr Gazza · 21-04-2023, 12:30 PM

When I order my plugs I look for the suffix number 4339.
This is sometimes called a stock number or type number, but basically you are looking for that 4 digit number
That should get you detachable nipples..

Not actually sure if the number is the same for all the NGK plug grades, it definitely works for my DCPR8E. If not you'll have to just ask the supplier.

Halfords always used to have a little chart listing all the equivalents on the spark plug shelf.. Do they still have Halfords?

Luddite · 21-04-2023, 01:39 PM

Quote:

Originally Posted by alan s4

Has anyone got an equivalent code for another brand?

Well, the Bosch equivalent is YR4DE but I don't know what kind of terminal they have.

Quote:

Originally Posted by Mr Gazza

Not actually sure if the number is the same for all the NGK plug grades, it definitely works for my DCPR8E. If not you'll have to just ask the supplier.

Unfortunately, Mr G, while you can get detachable nipples for plugs in the 8 heat range, the 9s are only available with solid terminals for some reason.

Mr Gazza · 21-04-2023, 02:53 PM

Really?

https://www.ebay.co.uk/itm/115660915...3ABFBMgr7axPRh

https://www.ebay.co.uk/sch/i.html?_f...CPR9E&_sacat=0

Luddite · 21-04-2023, 03:11 PM

Well found, Mr G!

That's well worth knowing.

jerry · 04-05-2023, 05:20 PM

My S4 has always run nicely on NGK Iridiums but I do have custom maps and tuning

21-04-2023, 10:38 AM	#1
alan s4 Registered User Join Date: Sep 2013 Location: Glasgow Bike: S4 challenge Posts: 447	NGK spark plugs S4 Can someone give me the EXCACT code for NGK plugs for my S4. OEM Champions are stupid money. Tried iridium and they sooted up and were oily very quickly, so want to go back to NGK. Ordered a set online however the little nipple thing on the top was fixed and I need to get it off. I thought you could screw off for most spark plugs! Thanks

21-04-2023, 12:30 PM	#4
Mr Gazza Lord of the Rings Join Date: May 2013 Location: Norwich Bike: M900sie Posts: 5,831	When I order my plugs I look for the suffix number 4339. This is sometimes called a stock number or type number, but basically you are looking for that 4 digit number That should get you detachable nipples.. Not actually sure if the number is the same for all the NGK plug grades, it definitely works for my DCPR8E. If not you'll have to just ask the supplier. Halfords always used to have a little chart listing all the equivalents on the spark plug shelf.. Do they still have Halfords? __________________ Last edited by Mr Gazza; 21-04-2023 at 12:34 PM..

21-04-2023, 02:53 PM	#6
Mr Gazza Lord of the Rings Join Date: May 2013 Location: Norwich Bike: M900sie Posts: 5,831	Really? https://www.ebay.co.uk/itm/115660915...3ABFBMgr7axPRh https://www.ebay.co.uk/sch/i.html?_f...CPR9E&_sacat=0 __________________

04-05-2023, 05:20 PM	#8
jerry Old Git Join Date: May 2006 Location: Cricklade Bike: Multiple Monsters Posts: 2,826	My S4 has always run nicely on NGK Iridiums but I do have custom maps and tuning __________________ MONSTERMAN

21-04-2023, 11:53 AM	#2
Luddite Registered User Join Date: Aug 2011 Location: Southampton Bike: M1100evo Posts: 2,465	If your standard plugs are RA59GC, then I think the direct NGK equivalent is the DCPR9E. However, this only comes with a solid terminal nut. The only NGK fitment I'm aware of with a removable terminal nut is the iridium version DCPR9EIX. Before giving up on the iridiums, are you sure you ran them with the correct gap? They need to be at 0.9 - 1mm to work properly. http://www.ukmonster.co.uk/monster/s...72&postcount=4 http://www.ukmonster.co.uk/monster/s...2&postcount=12

21-04-2023, 12:27 PM	#3
alan s4 Registered User Join Date: Sep 2013 Location: Glasgow Bike: S4 challenge Posts: 447	The S4 runs coil sticks so the terminal nut needs to be removable. Ive got NGK Iridium’s in my 996 and it runs happily on them. The S4 916 engine doesn’t get on with them at all, gap checked as well. Has anyone got an equivalent code for another brand?

21-04-2023, 03:11 PM	#7
Luddite Registered User Join Date: Aug 2011 Location: Southampton Bike: M1100evo Posts: 2,465	Well found, Mr G! That's well worth knowing.