Br9ecs Vs. Br9eya

JDViper

JDViper

Lifetime Member
Joined
Feb 24, 2010
Messages
797
Location
Iola, WI
Website
s1231.photobucket.com
I have been running BR9EYA's ever since I have had a tripple because they were the only 9 that had a solid top Years back (I was told). Now I see that the ECS's also have a solid top. I know the YA's are cat plugs, but can anyone tell me what the other differences are?
Thanks
 
Not sure about eya but I noticed that the ecs is recessed compared to the es that most sleds call for. I have seen on other posts before where it is better not to use the recessed plugs, I myself have used both but never did any testing or anything to se if there is any gain. Im sure somebody will chime in for u.
 
Personally i run BR9EIX the iridium plugs. A little more money but certainly the better plug in my opinion. I found the ecs plugs were horrible with cold stars(fouled real easy)
 
The eix plugs u dont gap,they claim cleaner burn with a 2-5%hp increase.easier starting,longer operating life. Personally i found with my srx and some buddies that have srx's that they r hard on plugs and those ecs's foul on cold starts real easy. I havent fouled a plug since i switched.
 
Ecs will b richer anyways( according to posts I've seen here before) if its jetted a little rich to begin with, of course they foul easy. I never had problems with the es or ecs, same set all year and when I change em in the fall they usually don't need it, I just do it anyway. Have not tried iridiums in my sled but have used them in other applications before and I thought they didn't last as long as others. Maybe little gain there though when they work, don't know on that one
 
livewire_101proof said:
Ecs will b richer anyways( according to posts I've seen here before) if its jetted a little rich to begin with, of course they foul easy. I never had problems with the es or ecs, same set all year and when I change em in the fall they usually don't need it, I just do it anyway. Have not tried iridiums in my sled but have used them in other applications before and I thought they didn't last as long as others. Maybe little gain there though when they work, don't know on that one
Click to expand...

What does a plug have to do with rich or lean? All 9 series from NGK are of the same heat range, hence the 9. A hotter plug may cause detonation from the electrode being too hot. ECS are edge fire type plugs. EC are standard plugs. Not sure on the EYA, maybe resistor style? My srx has never fouled a plug. They do get changed yearly.
 
iridium plugs

i was told that the SRX should have br9ecsix plugs if you want to run iridium, i havent found any around, but do want to try them ,the br9eix would be the same as the br9es. i wouldnt take a chance with those,
 
The EYA is the same as the ES except it has a "V" grooved electrode. This is intended to focus the spark in a more consistent area which is slightly less prone to fouling. Porcelain is the same between ES and EYA. The ECS is quite different however.
 
plug choices

ding, would you think the v grooved eya plugs be safe to run on the srx on lakes etc, i'm still thinking on trying the br9ecsix plugs, some say a couple more hp?
 
snopax said:
What does a plug have to do with rich or lean? All 9 series from NGK are of the same heat range, hence the 9. A hotter plug may cause detonation from the electrode being too hot. ECS are edge fire type plugs. EC are standard plugs. Not sure on the EYA, maybe resistor style? My srx has never fouled a plug. They do get changed yearly.
Click to expand...


its not my personal experience but the recent post ive seen on here implied that because of the ecs being recessed that it didnt burn as efficient as others, and when i was researching my viper prodject with srx cdi it seemed while on the subject of venting carbs to box or atmosphere that using br9ecs also would be a trick to richening it up, like i said i have not tested this myself yet.
my thought is that no matter what plugs, if the jetting is right you shouldnt have to worry about fouling. i myself have just used the regular br9es cause its common with my other sleds and if you ever get into a pinch other brand sleds use em also. that being said they are a very common plug, even alot of gas stations and such will cary them on hand. on a bad note, if u are using the same plug as everyone else, may be a burden if there are any moochers in your crowd. ( i say this cause there are a few i ride with that i supply alot of plugs to) seems like i have to refill my spare holders every ride but i dont use em at all.
even swaping to different plugs, if any gain will be minimal so unless your drag racing all the time its not worth it ( those guys take any little bit they can get) even when bang for buck isnt such a good ratio.
 
Last edited:
Last year I was riding with my wife and her grandpa. we never went over 40 MPH. My sled fouled a plug on that ride because it didnt get mant chance to "clear" itself out. I was running BR9EYA at the time. So should I be changing them to a different plug? What say you?
 
sounds like everyone has a preference, dont know if any testing has been done or not. i would not worry about it if that time was just a one time thing, if u regularly foul them then i would think about changing and/or making sure your jetting is where it should be. i dont have any first hand with the EYA plugs anyhow, but sounds like they may b a little better with not fouling according to ding.
 
As long as the posts are still around there are a couple good writeups on here about why the ECS in the SRX. I would do a search. Other than the SRX, the EYA is fine unless highly modded and tuned for something different. It does resist fouling more than the ES but only by a little bit.
 
Back in 97-99 I was working at a performance minded Polaris/Arctic Cat dealer in Ct, Cofiell's Sport And Power, when the Cat's started coming with the BR9EYA plugs. They were supposed to resist fouling better. We started using them in the Polaris as well. Since then, I've used EYA's in all mine and my family's sleds (Polaris and Yamaha). 2001 I raced my 2000 SXR on asphalt. I had run EYA's in it the entire prior snow season, had about 1600 miles on the plugs. One night at the drag strip, first run it ran 11.6 after it had been running 50's. My freind (running the SRX I now have) told me it was because of my "old" sprk plugs and to put a set of new plugs (BR9ES) in it. So I did. went and ran 11.9, no other changes. Put the "old" EYA's back in and ran 11.6 again on the next run, no other changes. Coincidence? Maybe, maybe not. I never did any other "testing" of EYA vs ES.

A few years ago, I came across this post on here about these spark plugs. Seems to possibly verify what I experianced.

"Hey guys here's a little bit of info for the non believers! This is a question i asked to the tech adviser at NGK!

There is alot of questions going around on a web site in regards to the difference between 3 spark plugs, they are , BR9ES, BR9ECS, and BR9EYA, could you elaborate a little more on these plugs, i referenced your chart on diciphering the codes but need more info, I know that they all have the same threads, they are all resistor types, they are all the same heat range, but what are the differences in the last digits, and will it affect any performance or reliability if they are switched, one for another.

He replyed:

The BR9ES has a standard non projected firing end and traditional height ground electrode. The firing position will be set at about 1.0mm from the combustion wall.

The BR9EYA has a slightly longer firing position set to 2.0mm and has a V-grooved center electrode for better ignitability and increased performance.


The BR9ECS also has a standard center electrode (non V-power). But it differs in that it has a much shorter and stronger ground electrode that helps to prevent ground electrode failure, especially in high rpm small engines that have a lot of vibration and bad harmonics. It has a much lower firing position at only .3mm.

If an application calls for the BR9ECS I would suggest ONLY using that plug as I have seen the BR9ES/EYA have ground electrode failures when substituted. If the applications for the BR9ES, then the BR9EYA could be used as a better performing option (so long as the engine has clearance for the extra 1mm of projection) as could the BR9ECS (especially in a racing application to be sure you won't have any ground failures, or in a forced induction or nitrous application). Hope this helps, thank you.



Best regards,

Brandon Peeler

Technical Support Representative
Aftermarket Division
NGK Spark Plugs (U.S.A.), INC.
46929 Magellan Dr.
Wixom, MI 48393

Bpeeler@ngksparkplugs.com

BR9EIX is what i run. Told to by the NGK rep as the spec'd plug (BR9ES) was spec'd when there was little to no ethanol in the gas. He said to run the EIX as they are anti fouling (like the ECS) and the ground strap is designed to disipate heat faster to prevent pre ignition of the ethanol in the newer gas."

Hope this helps!
 
You must log in or register to reply here.


Back
Top