What is the difference between these two plugs? I ran a br9es in my sled when it calls for a br9eya and had an o-ring blow. Not sure if it was related but would like to be able to rule it out as a possibility. Does one have a cooler heat range than the other? Thanks
BR9EYA vs. BR9ES
- Thread starter rmkrazi
- Start date
well the EYAs are platinum tips, that is the extent of my knowledge 
My understanding is that the eya's are used to reduce interference to the EFI controller (computer).
all i know is i fould ES plugs all the time, the EYA's last me like i dont know... 200 miles before i blow through a set.
either way, i have run the EYA's in all my doo motors even if they call for ECS's or ES's and never had any trouble.
either way, i have run the EYA's in all my doo motors even if they call for ECS's or ES's and never had any trouble.
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Sledsniper
Well-known member
Allot of times these plugs are built to munufacturer specs. Thus the added expence.I personaly think if the oem goes to the trouble of having a special plug made for there engine,I'm going to spend the extra couple bucks to run them in my 10g plus machine. Then again some peps think I'm rich because I don't skimp of the cheep stuff. Just my thoughts and I'm no expert.
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I see it like so... if my sled is gonna eat $10 plugs, but loves the $2.25 ones then i feed it the cheap guys. just how it is.
run what works better, and i have found that the EYA's hold better for me and my applications. thats just me.
run what works better, and i have found that the EYA's hold better for me and my applications. thats just me.
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Sledsniper
Well-known member
My point is most guys run br9es plugs because there cheeper .I was responding to the original post.Like I said I'm no expert,and getting chastised for having an opinyon is what keeps allot of people from stating there's.
they are both the same heat range. Most likely have nothing to do with your o-ring issue. Here is a chart to help with plug numbers.
http://www.ngksparkplugs.com/docs/tech/partnumberkey.pdf
http://www.ngksparkplugs.com/docs/tech/partnumberkey.pdf
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Sledsniper
Well-known member
So the A means "SPECIAL DESIGN" What differance could that make?
They are the same plug, except the YA means it has a V-grooved center electrode. The electrode has a small split on the end of it to help produce a better spark.
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Sledsniper
Well-known member
Y means 2.5mm insolator
E means 1.5 mm insolator
A means special design
I'm no expert thats just what the ngk chart says.
E means 1.5 mm insolator
A means special design
I'm no expert thats just what the ngk chart says.
If you look closely at porcelain part below the firing tip on BR9EYA and will see how far sunken it is below the thread part, that supposely help less fouling and longer interval usage that other type of plugs enchancing less exposure to combustion chamber. On other plugs, porcelain part would be extended above thread part, greatly exposure to combustion chamber which will foul sooner than EYA plugs.
I uses EYA plugs on all my cats from since 1996 and have replaced much fewer plugs.....
I uses EYA plugs on all my cats from since 1996 and have replaced much fewer plugs.....
Yes and no, that chart shown in the other post is only half the equation and only lists the firing end construction. The "E" and "Y" are separate components of the spark plug in the total listing, not together.
The "E" is for a 19mm thread reach and the "Y" is for the 2.5 mm insulator. They are not "EY" together. To get the 1.5 mm insulator (second "E"), you would have to buy an "BR9EEA". The only time letters are combined is sometimes in the construction lettering of the plug.
No, 9EYA is no colder than 9ES, 10 is colder, 8 is hotter.
Don't go too cold, anything below 450C is plug fouling territory. Anything above 800C and you are too hot.
Here is the full chart to determine all the parameters of the spark plug.
http://www.ngksparkplugs.com/docs/tech/design_symbols_plugs.pdf
Hope that helps.
NSC
my polaris uses BR9ES, which i can get at polaris dealer 1.5hrs away.BR9EYA is the same but has a v in the electrode.and are stocked at the cat dealer 15 min away.i was told by both dealers it was ok to use.
br9eya was introduced for sleds that tend to foul plugs on startup and whatnot (such as the srx)....same heat range just less fouling as stated above.
the only thing i could see different was the eya has the little groove like mentioned before. i know i can run on one set of eyas in my cat all season long if i want to with no issues, even with it being pig rich on the bottom and loading up like a mofo during warmup it will usually clean out within a short distance then run fine all day. oh and i've ran the doo ecs in it before with no issues either so i don't think the plugs caused your o ring issue.
Thanks...On one of my first rides of the season I went to change my plugs and thought I had stripped my head out. After inspecting the threads on the plug I noticed that they had began to actually separate from the rest of the plug and it exposed a portion of the internal electrode. I was thinking how f***'d I would of been if that piece came loose and fell into the cylinder while the machine was running. Probably has alot to do with over tightening the plugs. HMMMM?? Any way just something to be aware off. Thanks
EYA's are Cat specific plug....they run a little hotter tip temp...in a DOO deto can be easier to achieve...after a couple un-known issues I called NGK and talked to a "tech"...he said its the same heat range but Cat wanted a plug that didnt foul....just like the Champion RN57YC plugs are for Polaris twins, they have a "multi" heat range ??? hotter at low engine speeds cooler at WOT???
The NGK BPR9ES are the equivelant to the RN57YC...after testing the RN57YC or BPR9ES are Ok/better in a DOO than BR9EYA's...BJ
The NGK BPR9ES are the equivelant to the RN57YC...after testing the RN57YC or BPR9ES are Ok/better in a DOO than BR9EYA's...BJ
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NGK show only BR9EIX as compatible.
The electrode on the EYA plug extends a little farther into the cylinder. I am not sure if it was the cause, but several years ago I was using BR9EYA plugs in some older Arctic Cats that called for the BR9ES and had two of them burn pistons. I couldn't find any other reason. No more problems after I put them back together and went back to the ES plugs.
My $.02
My $.02
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