Compatible NGK Platinum Spark Plug CPR8EAGP-9 besides the stock CPR8EB-9

[2daMax]

I just had my Denso IU24 Iridium plugs removed and swap back to stock plugs. The IU24 is not suitable, performs worse off, and takes longer to start. I would not recommend Denso IU24 iridium for the S10. The Projected tip of the stock plug was specifically designed for the S10. If there is any equivalent replacement, be sure that it has a Projected tip. After swapping back to stock plugs, I noticed the Fuel consumption is improving.

All my current car, and previous bikes were using Iridiums and I get nothing but pluses. It was sad for me that it just didn't work out for the S10. I had these IU24 purchased from the US and brought over to me by a work colleague on his business trip to Malaysia. (Too many counterfeit iridiums in my country)

So, I had a whatsapp group of S10 owners in Malaysia and notified them about my findings. Back 1 step, I made some research on NGK other projected tips plugs and came upon a CPR8EA-9, used in a low cost moped (Yamaha LC135). Projected tip, yes, but is without a terminal nut. Then I came across an upgrade to that plug, Platinum tip, CPR8EAGP-9, and NGK called it G-Power series. So, I just told the guys about G-Power. 2 of them was in the plug service timeline and took on my findings and became guinea pigs. This Platinum does not have the terminal nut as well. You will need to use the terminal nut from your existing plug. Because of this, this plug has been out of the S10 radar.

Now, here is what they told me. The 'T' mode behaves like a 'S' mode. No other issues found. Being platinum, it should go 30 to 40k km easy. I am going to get a set next week and experience it for myself. Just thumbs up.

I helped this person to Sync his TB, Reference screw turn out 1/2 turn from fully closed in, and then CO adjustments to +8 for both Cylinders (K&N air filter and Akra exhaust), now he just could not wipe the smile off. Never seen him changed from subtle to like a happy kid with all the excitement. According to him, better response and the power delivery is linear. He rode 400km just to had me helped him sync and CO. (he also had plugs changed earlier, handle bar alignment job done at a workshop with low labor rates). I used a home made manometer made of aquarium air hose and fill with ATF oil. His bike was off by about 6 inch between the 2 throttles.

 

[SilverBullet]

...Now, here is what they told me. The 'T' mode behaves like a 'S' mode. No other issues found. Being platinum, it should go 30 to 40k km easy. I am going to get a set next week and experience it for myself. Just thumbs up...

This is an unbelievable claim for me. Unless it was comparing an improper running bike fitted with Denso IU24's.

Platinum and Iridium plugs are great for long life. You might squeeze another 1 mpg and possibly slightly smoother idle. But big performance gains are just not gonna happen.

Even so I would still consider buying them if the price difference was not too great. But did a quick search and looks like the plug is not available from US suppliers. I did find them on Ebay from India but at 2-1/2 times the price of regular plugs. My regular plugs get replaced at ~30K miles (~50k kms) and still look and perform fine. Since that is a maintenance interval for air filter, TBS and valve check I would be hard pressed not to replace the better plugs at that same interval anyway.

Best price on stock plugs here:
http://www.rockauto.com/en/partsearch/?partnum=CPR8EB-9

_

 

[Checkswrecks]

SilverBullet -
While 2daMax speaks English really well, there's a confusion here in choice of words.
His meaning is that there is no problem in either mode.


Thanks 2daMax

 

[2daMax]

My intention is to notify about an alternative plug n perhaps with some advantage. My English may not be perfect, so apologies if the intention wasn't made clear enough.

The user who made the claim was on stock cpr8eb, and not iu24 iridium. Butt dyno experience so YMMV.

Price per plug is approximately less than US$5 each in local stores. CPR8EB-9 plugs cannot be found in stores in my country. Closest place to get is our neighbor Singapore and is not cheap. Our side of the planet works differently.

 

[4jranch]

I have the Denso 5362 IU24 in the bike at this time. Not sure I can tell any difference. I am just looking for longevity. Will see.

 

[Kevs]

I just had my Denso IU24 Iridium plugs removed and swap back to stock plugs. The IU24 is not suitable, performs worse off, and takes longer to start. I would not recommend Denso IU24 iridium for the S10. The Projected tip of the stock plug was specifically designed for the S10. If there is any equivalent replacement, be sure that it has a Projected tip. After swapping back to stock plugs, I noticed the Fuel consumption is improving.

All my current car, and previous bikes were using Iridiums and I get nothing but pluses. It was sad for me that it just didn't work out for the S10. I had these IU24 purchased from the US and brought over to me by a work colleague on his business trip to Malaysia. (Too many counterfeit iridiums in my country)

So, I had a whatsapp group of S10 owners in Malaysia and notified them about my findings. Back 1 step, I made some research on NGK other projected tips plugs and came upon a CPR8EA-9, used in a low cost moped (Yamaha LC135). Projected tip, yes, but is without a terminal nut. Then I came across an upgrade to that plug, Platinum tip, CPR8EAGP-9, and NGK called it G-Power series. So, I just told the guys about G-Power. 2 of them was in the plug service timeline and took on my findings and became guinea pigs. This Platinum does not have the terminal nut as well. You will need to use the terminal nut from your existing plug. Because of this, this plug has been out of the S10 radar.

Now, here is what they told me. The 'T' mode behaves like a 'S' mode. No other issues found. Being platinum, it should go 30 to 40k km easy. I am going to get a set next week and experience it for myself. Just thumbs up.

I helped this person to Sync his TB, Reference screw turn out 1/2 turn from fully closed in, and then CO adjustments to +8 for both Cylinders (K&N air filter and Akra exhaust), now he just could not wipe the smile off. Never seen him changed from subtle to like a happy kid with all the excitement. According to him, better response and the power delivery is linear. He rode 400km just to had me helped him sync and CO. (he also had plugs changed earlier, handle bar alignment job done at a workshop with low labor rates). I used a home made manometer made of aquarium air hose and fill with ATF oil. His bike was off by about 6 inch between the 2 throttles.

Leslie?
if so.. Kev here!

so waiting for yr reviews & Im searching for the plugs in SG to try myself too.

Oh & I saw some came with the terminal nut..

but then, ::006::

 

[2daMax]

Hi Kev. You found me.

If all is good I will drop by the bike shop tomorrow n purchase 4 plugs. Friend paid RM18 each so that's what I am expecting to pay.

 

[SilverBullet]

Hi Kev. You found me.

If all is good I will drop by the bike shop tomorrow n purchase 4 plugs. Friend paid RM18 each so that's what I am expecting to pay.

Good price. Next time I'm overseas I will buy a couple dozen and start using the upgraded NGK plug.

_

 

[Kevs]

Hi Kev. You found me.

If all is good I will drop by the bike shop tomorrow n purchase 4 plugs. Friend paid RM18 each so that's what I am expecting to pay.

wah.. after converting to SGD, cheap lor..

still searching over here..

do update yr review after install!

 

[2daMax]

Installed, CPR8EAGP-9 Platinum plugs. T mode feels like S mode, is pretty true to a certain extent. The bike is more responsive. The rider that installed this earlier feedback that it gave some fuel savings, from 5.2l per 100km to 4.8l per 100km after changing the plugs.

Platinum (G-Power) vs stock. Both having Projected tip.


Here is with Denso Iridium IU24. Without the projected tip, the IU24 performs poorer than the stock plugs.

 

[2daMax]

Update:

1. The OEM stock plug's terminal nut is NOT REMOVABLE. If you attempt to remove it, it will break the plugs.
2. Some "universal" after market plugs comes with removable nuts. You can spot them by looking at the nut itself. if it is a hollow threaded all the way through (you can view the threaded rod of the plugs), then it is removable. If the top nut surface is not hollow, it is not removable.

On the bike side, here is what I feel this plug gives:
1. Better fuel economy. Observed by the figures given on Average fuel consumption. It is showing better mileage than before, same route and timing. I need to observe a couple more full tanks and make the calculations. Not completed 1 tank at the moment.

2. My friend and I say that it feels like a S mode while on a T mode initially. let's say, it is 80% close to a S mode. The throttle response is a lot quicker in T mode. No longer lethargic and feels like a 250cc bike.

3. S Mode. More like Kick-S mode now. It's a rocket. I have to becareful on my right hand or I'll get in trouble.

 

[Checkswrecks]

It looks like everything except the electrode stays the same, and that the electrode goes from a massive to a fine wire nickel.

Now that you've put a few miles on, it would be a good idea to pull the plugs briefly to inspect them. You should be OK, but want to make sure it's not running too hot. You can Google for more like below:
spark plug color chart

 

[2daMax]

Checkwrecks, I hear you. I plan to do the check in another time but so far I believe I am OK. I will post an update once I've done the checks. There are no indication of pre-ignition or engine pinging/knocking to indicate a overly hot condition of the plugs. I know what it feels like to have pre-ignition which comes with loss of power. Been there with the unintentional use of counterfeit iridium plugs on my car.

 

[2daMax]

An update to the G-Power after 8k km usage. Taken from the Left Most plug well.

 

[Xclimation]

I'm trying to find these G-power plug here in the US. Anyone know how to get them? Why wouldn't they sell these in the US?

Edit: Just got off the phone with NGK. Had a nice conversation. They put me through to tech. support and got a female who rides a Honda CBR1000RR and seemed to know her stuff! It sounds like she does her own work on her bike....(I'd be curious to see what she looks like....)

I asked why they don't offer the CPR8EAGP in USA. She told me probably there are not as many applications in the US for the plug.

She gave me 2 alternatives which she said are in the same heat range, and are "superior" (her words) to the CPR8EAGP-9.

The part numbers are: CR8EIB-9 also 5258
MR8AI9 also 7692

She said with these plugs we should get better starts and better throttle response.

She also said not to use plugs with the screw on electrodes at the top. She said that vibrations can cause them to come off. I pointed out we have the screwed down coil and it couldn't happen and that I've never had that happen on any of my bikes and having ridden cruisers in the past. She claimed that it has happened to her. And she pulled the "I've been riding for 26 years" card on me!!! Fun conversation we had....

She also stressed to NOT use a plug with a different heat range and that each step up or down is a 200 degree difference!?!

 

[SilverBullet]

The alternate p/n's supplied to you are not projected tip plugs so not recommended. You can find the G-Power plugs on Ebay, ~$11 each shipped from India.

_

Sent from my SM-G860P using Tapatalk

 

[Xclimation]

The alternate p/n's supplied to you are not projected tip plugs so not recommended. You can find the G-Power plugs on Ebay, ~$11 each shipped from India.

_

Sent from my SM-G860P using Tapatalk

Not going to pretend to know to much about spark plugs. I just know what they do.....Had to learn about what projected vs. non-projected tip is/does.
In looking at the pictures of both what I gave and the CPR8EAGP-9, the tips look identical?
I DO NOT want to give the wrong information! I will call NGK back tomorrow and ask for further explanation.
From what I read about projected vs. non-projected......Projected is for higher compression if piston clearance allows....

https://www.ngk.com/product.aspx?zpid=9675 definitely looks projected?

https://www.sparkplugs.co.uk/technical-glossary/ Explanation of what projected vs. non-projected.

And if you look up the tips on the cpr8eagp-9 g-power....the tips are identical?

I'm not saying you are right are wrong. I just want the best plug for the application (our bike.)

 

[2daMax]

Looks like the NGK 5258 CR8EIB-9 is projected enough for me, although there is no "P" in the model number. I would not hesitate to use this. A good example of non-projected iridium is the IU24 from Denso and I have poor experience with it. The pricing is good for iridiums, around US$7.XX each, and if I am living in the US, would surely try this out.

Only thing to confirm is the reach of the electrodes, if they are the same with stock plugs.

 

[2daMax]

18k km update on the NGK CPR8EAGP planitum plug.

 

[Nikolajsen]

Looks fine