Sparkplugs

[Blue_eyes]

Re: Iridium sparkplug as replacement for the NGK CPR8EB-9

The ND IU-24 does not appear to be a direct replacement, but might work just fine. The difference is that the IU-24 does not have a projected tip, whereas the OEM NGK CPR8EB9 does.

Here is what one source says about the purpose of a projected tip spark plug:

"Projected plugs initiate the flame-front closer to the center of the combustion chamber, which has an effect similar to advancing the timing. This lets the total ignition advance be reduced, decreasing the chances of detonation while providing superior throttle response. A projected plugs longer core nose provides a hotter plug at low speed to help prevent fouling. As engine speed increases, the incoming air/fuel mixture flows across the core nose tip, providing charge cooling that effectively reduces the heat range for increased top-end detonation resistance."

Here are pics of the physical differences.

You are totally correct regarding this. I have some hesitation myself to replace the sparkplug with one without the projected tip. Yamaha did not choose this particular model sparkplug for nothing.
I think for now I stick with the standard one,

 

[EricV]

Re: Iridium sparkplug as replacement for the NGK CPR8EB-9

Here is what you put down "number AR12Y5" but when I looked them up on their site i couldn't find that but did find AR12YS so it that an S and not a 5? No prices listed so don't know how to order them. How much for 4 of them?

doctorj

If you click on the Store link and do a search for AR12YS, it comes up at $12.99 each for those plugs. Or $52 for a set of 4. Not saying that is the desired plug or not, but I couldn't find the Y5 ending plug on their site either.

FWIW, I've done a lot of performance car stuff too and never saw any improvements with irridium or other plugs in terms of Hp when doing back to back dyno runs. I have been using the irridium plugs on my now sold FJR simply for the extended change intervals. Instead of 16k, I was going 50k between intervals. Seemed to work well for me, but YMMV, so go with what feels right for you.

I don't think anyone will notice any huge or significant difference in how the bike runs with any of the alternative plugs available. We are not on the hairy edge of combustion performance like high boost FI engines or uber high compression NA engines. ::017::

 

[~TABASCO~]

Re: Iridium sparkplug as replacement for the NGK CPR8EB-9

If you click on the Store link and do a search for AR12YS, it comes up at $12.99 each for those plugs. Or $52 for a set of 4. Not saying that is the desired plug or not, but I couldn't find the Y5 ending plug on their site either.

FWIW, I've done a lot of performance car stuff too and never saw any improvements with iridium or other plugs in terms of Hp when doing back to back dyno runs. I have been using the iridium plugs on my now sold FJR simply for the extended change intervals. Instead of 16k, I was going 50k between intervals. Seemed to work well for me, but YMMV, so go with what feels right for you.

I don't think anyone will notice any huge or significant difference in how the bike runs with any of the alternative plugs available. We are not on the hairy edge of combustion performance like high boost FI engines or uber high compression NA engines. ::017::

I agree... I run iridiums in all my bikes and I cant really tell any difference except for one.. The one that is basically a V-Twin race motor. The plugs helped the break up at the top of the RPM's.. Its also running big coils with extra spark-juice... Other than that you change them less often and they tend to stay cleaner for much longer...

 

[Tremor38]

Re: Iridium sparkplug as replacement for the NGK CPR8EB-9

+1 on what Eric V and Tabasco wrote. About the only advantage I've experienced with iridium plugs is the longer interval between changes. Unless you're running a race engine, I don't think you'll experience much more than an a placebo effect....especially from our screaming high RPM S10 motors

Maybe we'll see some benefits when Blue eyes finally gets his new cam's, port/polish, bee hive valves springs, spark advance increase and knife-edged crank ? 8)

 

[EricV]

Re: Iridium sparkplug as replacement for the NGK CPR8EB-9

Maybe we'll see some benefits when Blue eyes finally gets his new cam's, port/polish, bee hive valves springs, spark advance increase and knife-edged crank ? 8)

Wait, don't for get to do the ceramic and polymer coatings and o-ring the head/block!

 

[Checkswrecks]

Resurrecting an old thread...


The plugs in our bikes are NGK CPR8EB-9 and I just chased around trying to find replacements on a Sunday. The lesson I've learned and wish to convey is to order these ahead of time. The other vehicles I found using these plugs are a couple KLX dirt bikes and ATVs.


My first thought was to look at the more common Iridium CR8EIX, since I've got a set for my son's bike.


Don't do it. It would work in a pinch, but the only 2 things in common are the 10 mm size and the heat range. Our stock CPR8EB-9 has an extended tip and the CR8EIX positions the spark 2mm closer to the head, meaning you could have detonation under heavy load or at high rpm. The stock plug is a resistor plug, meaning that it's less likely to give off ignition noise if you have a radio or intercom. The CR8EIX would need a metal screwcap that does not come with the plug.


Better to swap each cylinders' A & B plugs. I'll change them after the trip we are about to go on.


Oh, and do NOT use anti-seize with NGK plugs. They already have an anti-seize coating, plus there is a Tech Bulletin from NGK not to because it reduces running turque enough that people have done damage in tightening.

 

[Firefight911]

So, to distill that down...

Read the manual and do what it says.

Got it.


Sent from my iPhone using Tapatalk

 

[Twitch]

Better to swap each cylinders' A & B plugs.

I'm not sure I understand this. You're just saying replace all four at the same time with the spec plug, right?

I agree having an extra set of plugs around seems like a good idea. I actually bought a box of 10 plugs when I got the bike 'cuz they're cheaper packaged like that but just installed a fresh set for the first time a couple days ago right at 12,025.

 

[Checkswrecks]

I'm not sure I understand this. You're just saying replace all four at the same time with the spec plug, right?

I agree having an extra set of plugs around seems like a good idea. I actually bought a box of 10 plugs when I got the bike 'cuz they're cheaper packaged like that but just installed a fresh set for the first time a couple days ago right at 12,025.

I swapped the inboard and outboard plug for each cylinder, largely because there wasn't much else I could do, and partly because when looking with a magnifying glass (work habit for an engineer) they had a difference in wear. The difference made me think Fred was probably correct in this old post for the FJR, which the Super Tenere shares electrical design with:
http://www.fjrforum.com/forum//index.php?showtopic=118598&st=0

 

[Twisties]

I just went to the store and got 4 plugs. I asked CPR8EB-9, but when I got home I noticed that I ended up with CPR8EA-9. I've been poking around trying to find NGK's coding to see what the difference is. Just curious as I expect to replace them with the right part.

 

[protondecay123]

Did anyone do anything to remove the old locktite from the bolt holes for the plug coils? I burned the locktite off the bolts, let them cool and soaked them in acetone and wire brushed them. I put a few drops of acetone on the bolts and ran them in and out of the bolt holes. My warning >
GDMFin' cylinder head breather hose!

 

[Twisties]

I just went to the store and got 4 plugs. I asked CPR8EB-9, but when I got home I noticed that I ended up with CPR8EA-9. I've been poking around trying to find NGK's coding to see what the difference is. Just curious as I expect to replace them with the right part.

Ahhh.... found it: NGK Code Chart

 

[protondecay123]

Here's a photo of my spark plugs at 11, 800 miles.

I think that they could go another 8 K easy.

 

[Dallara]

Here's a photo of my spark plugs at 11, 800 miles.

I think that they could go another 8 K easy.

The original plugs in mine still looked almost new at 16,500 miles, but I stuck in some new ones just because I was there. I swear the original set could have gone another 16,500, easy. That's one of the wonderful things about today's coil-on-plug ignitions!!! ::012::

Dallara




~

 

[k woo]

Changed mine today at 20,373 miles, could have ran them many more miles. I run ethanol free premium about 85 % of the time. When back with the factory NGKs. 8)

 

[Tremor38]

Re: Question on NGK Iridium Spark Plugs

From what I can find here in Japan, only Denso makes an iridium plug specifically for the S10. Seems to me that Roberto (Thagua) took some measurements awhile back and figured out a suitable NGK plug from that. I don't recall the part number and I still can't find an NGK plug listed for the S10.

 

[dcstrom]

Re: Question on NGK Iridium Spark Plugs

IIRC the NGK version is a little shorter in the thread than it needs to be, but Thagua is using them anyway without problems. Roberto??

 

[Dallara]

Re: Question on NGK Iridium Spark Plugs

Any one used these on the Super Tenere? What number to use if at all recommended? What would the advantage be over the normal NGK plugs?

Just curious...

Why do you want to use the Iridium plugs? Are you having some issue with the standard spark plugs?

Reason I ask is that I am having spectacular success with the standard plugs. I replaced the original set at 16,500 miles, but only because I had already pulled them. The originals that came out looked like they could easily do another 16,000 miles or more. I have over 38,000 miles on the bike now, and I pulled the plugs at 32,000 just to see, and again, they looked nearly new, so they went back in. From my experience the Super Tenere is very easy on spark plugs.

Thanks!

Dallara



~

 

[Koinz]

Re: Question on NGK Iridium Spark Plugs

::026::

I was also looking for iridium plugs, but when I couldn't find any for the S10, I purchased 4 new standard plugs. When I pulled the old ones out at 22K Miles, they looked great. I put the new ones in anyway just because I had them and they were cheap enough. I guess if one does go bad, I have 4 old spares I could use. I don't remember the last time a 4 stroke spark plug failed on me though unless the motor is an oil burner (that's a different story).

 

[~TABASCO~]

Re: Question on NGK Iridium Spark Plugs

Last time I checked I thought the Iridium were a little longer or shorter than stock... We just throw factory plugs back in customers and my own bike... Throw in a set of stockers !