Spark plugs!!

[POLZIN]

I have always had better luck with NGK plugs in every polAris I've ever owned

 

[RMK-King]

Answer fronm NGK:
Hello,

Sorry, but the BPR series won't work. The indexing is the biggest difference, Don't replace the GR9A-EG with the BPR9ES/EIX, as engine damage can result.

Best Regards,

Andrew Hauenstein
Technical & Training Specialist
NGK Spark Plugs (USA), Inc

Not much of an aswer.

Hmm, not sure if I believe that since guys are running the BPR9ES in their 12s already with no issues.

 

[BackCountryBob]

Just for kicks I emailed NGK tech support and asked:
Polaris calls for the GR9A-EG in my '12 Switchback 800

Will the BPR9ES or the BPR9EIX work ok?

What is the difference between the GR9A-EG (2012 model sled) and the BPR9ES (2009-11 Models) plugs?


Answer fronm NGK:
Hello,

Sorry, but the BPR series won't work. The indexing is the biggest difference, Don't replace the GR9A-EG with the BPR9ES/EIX, as engine damage can result.

Best Regards,

Andrew Hauenstein
Technical & Training Specialist
NGK Spark Plugs (USA), Inc

Not much of an answer.

INDEXING--most high performance 2 stroke engines require that the plugs be indexed--the open side of the electrode must face the intake port for proper flame and timing. This is an important issue. Mark the open side with a marker on the insulation and see if it lines up with the intake--if it does, you are correctly indexed. Sometimes you might have to try several plugs before you can find properly threaded plugs to give you the proper index--I think 20 degrees either side of center is OK.

BCB

 

[RMK-King]

INDEXING--most high performance 2 stroke engines require that the plugs be indexed--the open side of the electrode must face the intake port for proper flame and timing. This is an important issue. Mark the open side with a marker on the insulation and see if it lines up with the intake--if it does, you are correctly indexed. Sometimes you might have to try several plugs before you can find properly threaded plugs to give you the proper index--I think 20 degrees either side of center is OK.

BCB

I just checked the factory plugs on my 2012 Assault and they were opposite of what you just mentioned. The open section was pointed towards the exhaust. I put some bpr9eix irredium plugs in and the gap was pointed towards the intake ports. Anyone know the correct way or if it even matters??

 

[RMK-King]

After doing some more online research everything I have read says indexing is not needed on a carbed or efi 2 stroke, only direct injected 2 strokes such as the E-tek need plug indexing.

 

[NapaMatt]

Also.. The Gaping them at .018.....

Is what i do... You can do something else..

 

[sledwolf]

really? I've never heard that low even for turbo aps.

It says right in the Boondocker install notes to gap them 18-20 thousenths max.

 

[2XM3]

bpr9eix is what I run it all the sleds, almost impossible to foul.. a very good plug imho

 

[High Velocity]

Also.. The Gaping them at .018.....

Is what i do... You can do something else..

And why, might I ask, do you gap them incorrectly at .018" ?


Sent from my iPhone when I should be sledding.

 

[NapaMatt]

Easier for the Coil to Jump a Gap of .018.. then a gap of .027

It all the little things in a sled, that add up to a "Great" running Sled this is just one of those things " I Do"

Its Always works, Why change somethings that always works for me!

IDK, Maybe out of Habit!

Happy New Year!

 

[Bamboozled]

Sooooooo... I just bought a used 2011. It had Champ RN 57YCC in it but the owners manual supplement says to use BPR9ES. I think I'll run the NKG they were $2 each at FF. Any problems with that?

 

[sledstew]

Guys there is a fix for fouling issues,especially on the turbo. The turbos are blowing the flame out ,if you need a fix i have it for $84 a sled.

Pm me if your interested or give me a call 701-202-6304
Jake

 

[xc6rider]

Easier for the Coil to Jump a Gap of .018.. then a gap of .027

It all the little things in a sled, that add up to a "Great" running Sled this is just one of those things " I Do"

Its Always works, Why change somethings that always works for me!

IDK, Maybe out of Habit!

Happy New Year!

Is it easier for current to jump the smaller gap, absolutely. But at the same time it creates less spark and would for a shorter period. Also, reducing some plug heat.

Are you going to notice a difference either way... Likely not.
I cant even remember the last time ive checked plug gap.... I glance at them, and as long as theyre not visually closed or open, i dont worry.

 

[Merlin]

INDEXING--most high performance 2 stroke engines require that the plugs be indexed--the open side of the electrode must face the intake port for proper flame and timing. This is an important issue. Mark the open side with a marker on the insulation and see if it lines up with the intake--if it does, you are correctly indexed. Sometimes you might have to try several plugs before you can find properly threaded plugs to give you the proper index--I think 20 degrees either side of center is OK.

BCB

Bob,

Not that I disagree with the logic behing spark plug indexing, I have yet hear of any real world experiences where it was found to make a noticeable difference in performance.............Maybe measureable on a dyno but negligible during "seat of the pants" testing???

Although they say "every little thing counts", I'm just not conviced that spark plug indexing is worth the hassle..............

Maybe you've had different experiences though???

Glen

 

[theletup]

Is it easier for current to jump the smaller gap, absolutely. But at the same time it creates less spark and would for a shorter period. Also, reducing some plug heat.

Are you going to notice a difference either way... Likely not.
I cant even remember the last time ive checked plug gap.... I glance at them, and as long as theyre not visually closed or open, i dont worry.

This is absolutely correct. A larger gap will create a longer burn with an increased spark and a hotter burn. Obviously the goal is to burn as much of the fuel mixture entering the cylinder as possible. Are going to notice a difference between .018" and .027"? Most likely not. I would think a .018" would be more likely to foul out. Do what ever floats your boat if it works for you but I just go off the manual specs.

 

[gman086]

Sooooooo... I just bought a used 2011. It had Champ RN 57YCC in it but the owners manual supplement says to use BPR9ES. I think I'll run the NKG they were $2 each at FF. Any problems with that?

No, they'll just foul more often. Did you read earlier in the thread? The Champ copper cores are better plugs; they're the direct offset to the NGK GR9A-EG that are spec'd for the 2012's. Why do you think Poo doesn't use the BPR9ES anymore? If you want an el cheapo plug just use NGK BR9ES! Less fouling = more ride time; technology happens.

Have FUN!

G MAN

 

[High Velocity]

G man, I had much different results running the Champion RN57YCC's in my '06 900 RMK. I could count on at least two or three per season failing on me. The NGK BPR9ES were much more reliable. The BPR9EIX (iridium) were even better yet and these are what I'm carrying for spares in my Pro.

 

[gman086]

G man, I had much different results running the Champion RN57YCC's in my '06 900 RMK. I could count on at least two or three per season failing on me. The NGK BPR9ES were much more reliable. The BPR9EIX (iridium) were even better yet and these are what I'm carrying for spares in my Pro.

You sure you're not confusing with the RN57YC (which I've used in my Doos and worked great) which is the direct offset to the BPR9ES?

 

[High Velocity]

You sure you're not confusing with the RN57YC (which I've used in my Doos and worked great) which is the direct offset to the BPR9ES?

Nope. The RN57YCC directly crosses over to a BPR9ES or BPR9EIX. According to Champion's numbering chart, the only difference between an RN57YC and an RN57YCC, is the YC is a "copper plus" and a YCC is "double copper". Same heat range, dimensions, projected insulator, etc.