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Thread: Spark Plugs

  1. #1
    Active Member RFM1009's Avatar
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    Default Spark Plugs

    i have a new M109r BOSS. Only has 3700 miles on it. ill have to do a spark plug change this next year. just wondering if everyone uses the stock plugs. I've had good luck with NGK. does anyone run the iridium? think the part# is CR8EIX(for the ngk anyway). already upgraded the exhaust with the freedom 2into1 turnout setup. gonna upgrade the intake to the cycle house q5 and have the ecu flashed. just wondering if these mods will require a different plug. any input would be appreciated.

    Thanks guys

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    Very Active Member StitchsLoft's Avatar
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    Interested in the answers for this as well...
    ~Stitch

    2008 M109R2 AGENTS OF S.H.I.E.L.D. by STARK INDUSTRIES


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    Very Active Member JUDAH-9's Avatar
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    Quote Originally Posted by RFM1009 View Post
    i have a new M109r BOSS. Only has 3700 miles on it. ill have to do a spark plug change this next year. just wondering if everyone uses the stock plugs. I've had good luck with NGK. does anyone run the iridium? think the part# is CR8EIX(for the ngk anyway). already upgraded the exhaust with the freedom 2into1 turnout setup. gonna upgrade the intake to the cycle house q5 and have the ecu flashed. just wondering if these mods will require a different plug. any input would be appreciated.

    Thanks guys
    I highly recommend sticking with stock/OEM NGK Spark Plugs. They are perfect for the M109R, whereas many members here have had a ton of problems with their 9s, after having switched to the Iridium CR8EIX Spark Plugs. All of those members immediately went back to the OEM NGK Plugs, and haven’t reported any problems since. Nevertheless, there has been a small handful of members here who had no issues after installing the Iridium CR8EIX Plugs. However, I wouldn’t take the risk of finding out.

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  6. #4
    Active Member RFM1009's Avatar
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    Quote Originally Posted by JUDAH-9 View Post
    Quote Originally Posted by RFM1009 View Post
    i have a new M109r BOSS. Only has 3700 miles on it. ill have to do a spark plug change this next year. just wondering if everyone uses the stock plugs. I've had good luck with NGK. does anyone run the iridium? think the part# is CR8EIX(for the ngk anyway). already upgraded the exhaust with the freedom 2into1 turnout setup. gonna upgrade the intake to the cycle house q5 and have the ecu flashed. just wondering if these mods will require a different plug. any input would be appreciated.

    Thanks guys
    I highly recommend sticking with stock/OEM NGK Spark Plugs. They are perfect for the M109R, whereas many members here have had a ton of problems with their 9s, after having switched to the Iridium CR8EIX Spark Plugs. All of those members immediately went back to the OEM NGK Plugs, and haven’t reported any problems since. Nevertheless, there has been a small handful of members here who had no issues after installing the Iridium CR8EIX Plugs. However, I wouldn’t take the risk of finding out.
    i kinda had a sneaking suspicion that would be the case. guess I'll stick with stock ones unless i run into problems. gonna check em often after i upgrade the intake and get the ecu flashed.
    Thanks

  7. #5
    Very Active Member Bering_C_Sparky's Avatar
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    I am one of the guys who run NGK Iridium plugs in my bikes and have been using them for many years without any issue.

    Can't speak for others experiences but I personally do not see how using an iridium plug could cause any problem.
    If your vehicle comes from factory with iridium plugs then it is recommended you do not use anything less, but I have never seen anything that implies there is any problem upgrading to iridium plugs from copper or platinum plugs. (other than a handful of guys saying this on social media and their stories being repeated a thousand times by others)

    Google it and read the difference between the plug types for yourself, there is tons of information on the subject out there.

    Honestly no matter which type of plug you choose it is going to work fine as long as it is a quality plug. You are more likely to have a problem due to installing the plug or wire incorrectly than due the material the electrode is made of.
    Stick with the "8" heat range designation unless there is an obvious reason to change from that.

    BCS

    https://www.ngk.com/ngk-spark-plug-metal-types


    https://www.championautoparts.com/Pa...Materials.html
    Last edited by Bering_C_Sparky; 2 Weeks Ago at 02:04 AM.

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    Very Active Member Metalman's Avatar
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    BCS,
    Long time no see. We are still in KY and not sure when we will be returning to FL.

    I wonder why you use iridium plugs. To get better fuel mileage, more power, longer lasting, better running engine, etc.? I've heard both pro and con about using them?

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    Active Member RFM1009's Avatar
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    BCS: thanks for the info. appreciate it.
    ill be sending my ecu your way for a full flash here pretty soon.

  10. #8
    Very Active Member Bering_C_Sparky's Avatar
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    Quote Originally Posted by Metalman View Post
    BCS,
    Long time no see. We are still in KY and not sure when we will be returning to FL.

    I wonder why you use iridium plugs. To get better fuel mileage, more power, longer lasting, better running engine, etc.? I've heard both pro and con about using them?
    Hello Mike,

    I can't say there is any noticeable difference between one type of plug or another, our bikes are not huge HP so any plug in the correct heat range is going to work just fine.

    I am an electrician, when I compared conductive properties of the thin wire iridium plugs to the standard nickel plated copper plugs the iridium win hands down and that pretty much convince me to start using them.
    I also find it easier to read the single strap compared to the dual strap of the OEM plugs.

    Watching this storm tonight to see what it is going to do.
    May have to start building barricades and sandbagging in the morning.

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    Very Active Member Fishman349's Avatar
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    Quote Originally Posted by RFM1009 View Post
    i have a new M109r BOSS. Only has 3700 miles on it. ill have to do a spark plug change this next year. just wondering if everyone uses the stock plugs. I've had good luck with NGK. does anyone run the iridium? think the part# is CR8EIX(for the ngk anyway). already upgraded the exhaust with the freedom 2into1 turnout setup. gonna upgrade the intake to the cycle house q5 and have the ecu flashed. just wondering if these mods will require a different plug. any input would be appreciated.

    Thanks guys
    Is there a reason you are changing the plugs at that mileage?
    H.C. Velocity Pro, Cobra Power Pro Black, Cobra Engine Guards, ISO Blk Grips, National Cycle VStream Tour, Kuryakyn Switchblade Pegs, G/M TRE, .....

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    Active Member RFM1009's Avatar
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    Quote Originally Posted by Fishman349 View Post
    Quote Originally Posted by RFM1009 View Post
    i have a new M109r BOSS. Only has 3700 miles on it. ill have to do a spark plug change this next year. just wondering if everyone uses the stock plugs. I've had good luck with NGK. does anyone run the iridium? think the part# is CR8EIX(for the ngk anyway). already upgraded the exhaust with the freedom 2into1 turnout setup. gonna upgrade the intake to the cycle house q5 and have the ecu flashed. just wondering if these mods will require a different plug. any input would be appreciated.

    Thanks guys
    Is there a reason you are changing the plugs at that mileage?
    well i just meant ill need to do it next season some time. not now. but it's turned winter here(i live in Montana). so I'm thinking of what i could be doin to the bike while it's not being ridden. i mentioned i was upgrading the intake and getting an ecu flash. wasn't sure but what those mods might require a new plug. but it sounds like the oem ngks are the way to go.

  13. #11
    Very Active Member Fishman349's Avatar
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    Quote Originally Posted by RFM1009 View Post
    well i just meant ill need to do it next season some time. not now. but it's turned winter here(i live in Montana). so I'm thinking of what i could be doin to the bike while it's not being ridden. i mentioned i was upgrading the intake and getting an ecu flash. wasn't sure but what those mods might require a new plug. but it sounds like the oem ngks are the way to go.
    I have the original plugs with 38,000 Km 23,612 Miles and they seem to work ok. Have a look at you manual and see when the recommended replacement is. I'm one of those guys that thinks, if it ain't broke don't fix it. You usually can't go wrong with OEM parts.
    H.C. Velocity Pro, Cobra Power Pro Black, Cobra Engine Guards, ISO Blk Grips, National Cycle VStream Tour, Kuryakyn Switchblade Pegs, G/M TRE, .....

  14. #12
    Active Member RFM1009's Avatar
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    Quote Originally Posted by Fishman349 View Post
    Quote Originally Posted by RFM1009 View Post
    well i just meant ill need to do it next season some time. not now. but it's turned winter here(i live in Montana). so I'm thinking of what i could be doin to the bike while it's not being ridden. i mentioned i was upgrading the intake and getting an ecu flash. wasn't sure but what those mods might require a new plug. but it sounds like the oem ngks are the way to go.
    I have the original plugs with 38,000 Km 23,612 Miles and they seem to work ok. Have a look at you manual and see when the recommended replacement is. I'm one of those guys that thinks, if it ain't broke don't fix it. [IMG class=inlineimg]https://www.m109riders.com/forums/images/smilies/grin.gif[/IMG] You usually can't go wrong with OEM parts.
    dont have the manual in front of me but i think it's 4500miles...which does seem soon.

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    Very Active Member thevili's Avatar
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    Quote Originally Posted by RFM1009 View Post
    dont have the manual in front of me but i think it's 4500miles...which does seem soon.

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    Active Member RFM1009's Avatar
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    ahhh. 7500 miles. i knew there was a 5 in there. yeah 4500 seemed a little too often.

  17. #15
    Very Active Member StitchsLoft's Avatar
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    I just hit 10K yesterday what is the EXACT OMG NGK plug we are to use

    STOCK SEEMS TO BE A CR8EK ? rynosback stated he went colder CR9EK's

    So what the difference say in a NGK CR7EIX IRIDIUM (7385) Vs. NGK CR8EIX Iridium (421

    I am not very Spark plug savvy! LOL
    Last edited by StitchsLoft; 1 Week Ago at 10:31 PM.
    ~Stitch

    2008 M109R2 AGENTS OF S.H.I.E.L.D. by STARK INDUSTRIES


  18. #16
    Very Active Member StitchsLoft's Avatar
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    Quote Originally Posted by RFM1009 View Post
    i have a new M109r BOSS. Only has 3700 miles on it. ill have to do a spark plug change this next year. just wondering if everyone uses the stock plugs. I've had good luck with NGK. does anyone run the iridium? think the part# is CR8EIX(for the ngk anyway). already upgraded the exhaust with the freedom 2into1 turnout setup. gonna upgrade the intake to the cycle house q5 and have the ecu flashed. just wondering if these mods will require a different plug. any input would be appreciated.

    Thanks guys
    FOUND THIS THREAD TOO!
    https://www.m109riders.com/forums/sh...d.php?t=140877
    ~Stitch

    2008 M109R2 AGENTS OF S.H.I.E.L.D. by STARK INDUSTRIES


  19. #17
    Active Member thrillseeker's Avatar
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    I use the iridium plugs. Went to stock plugs last change cuz they were cheaper big mistake. Bike did not run well and was running very rich. Switch back to iridium and runs smooth now and not rich should add that I have spike intake and debaffelled the exhaust. Also run xtre and cobra fuel processor.

  20. #18
    Very Active Member M109Dreamer's Avatar
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    I have been running the NGK Iridium's for years in my 07 as well. No issues here. The reason I switched way back when was I got tired or taking my front fairing off because it was a PITA. And now with a 1 piece fairing even a bigger PITA. My intent was to extend the change intervals between plug changes. I have had the last set in for 25+K miles and haven't had an issue. I do have another set going in this winter when I'll be changing all the fluids out.

    As far as going from 8's to 9', it pertains to the heat range of the plug. I say whatever you decide on stock NGK's or the Iridium's stick with the 8's and see how the bike runs. I have Tornado intakes, dragster exhaust and a BCS flashed ECU and haven't had any issues or thoughts on running a different temp plug.

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